This article displays the characters from the Paper Mario series, which consists of Paper Mario, Paper Mario: The Thousand-Year Door, and Super Paper Mario.

These are the Four Playable characters from the Paper Mario series. One thing they all have in common is that they were all prophecized to save the dimensions in the Light Prognosticus in Super Paper Mario.

• Mario is the primary protagonist of the series. The hero of the Mushroom Kingdom, he rescues the Star Rod from Bowser, to defeating a 1000-year old demon, and stops an evil prophecy from destroying all existence. He is joined by various partners throughout the games.

• Princess Peach is the princess of the Mushroom Kingdom; she assists Mario. In the first game, she gives him information of upcoming bosses and gives him items via a magical treasure chest. She eventually helps save the world from Bowser by wishing for Mario to have more strength. In the second game, she is kidnapped by the X-Nauts. While in captivity of the X-Nauts, she befriends their main computer, TEC, who is smitten by her, and assists her by allowing her to send e-mails to Mario's mailbox with helpful information about the X-Nauts' plans. In the third game, she is captured again by Count Bleck and forced to marry Bowser in order to cause the Chaos Heart to appear. Afterwards, she escapes the Count's clutches and reunites with Mario. She is one of the Four Heroes prophecized in the Light Prognosticus and is a fully playable character.

• Bowser is usually the main antagonist of the Mario series. After realizing that the Star Spirits refused to grant his wishes, Bowser steals the Star Rod to give himself unnatural abilities and defeat Mario. He fail to do so, and loses the Star Rod. In the second game, he is a minor playable character, and shocked by the kidnapping of Princess Peach (as he was trying to steal her himself). He tries to beat Mario to the Crystal Stars, without success. In the third installment, he is mentioned in the Dark Prognosticus as the monster king who, by marrying a pure-hearted princess, will cause the Chaos Heart to appear. He is also one of the Four Heroes mentioned in the prophecy of the Light Prognosticus that will save the dimensions from destruction. Bowser becomes a fully playable character.

• Luigi is Mario's brother and a protagonist. He is overlooked over in favor for his brother. In the first game, he leaves Peach's party early and therefore avoids becoming captured and remains at home throughout the story. He is jealous of Mario that he goes on adventures while he has to tend to their home. In the second game, he is encountered several times in Rogueport, claiming that he was on his own adventure while Mario was off trying to collect the Crystal Stars. An author interviewed Luigi and wrote a book series based on his adventures. In the third game, he plays a dual role. He is at first brainwashed by Dimentio, turning into "Mr. L", who attacks Mario with his "Brobot". After being restored, he comes to his senses and becomes Luigi again, as well as the fourth playable character.

In his adventures, Mario is assisted by various partners.

• Goombario takes his father's advice and accompanies Mario to save the Star Spirits. Outside of battle, he can tell Mario about the people he meets and the places he visits.
• Kooper: joins Mario's party to follow in the footsteps of his childhood hero, the archaeologist Kolorado. Outside of battle, he can retreat into his shell and Mario can shoot him out short distances, allowing him to flip switches, grab items and attack enemies.
• Bombette is an unwilling minion of the Koopa Bros.; when her temper got the better of her, she literally exploded on them, resulting in her being sent to the dungeon. She joins Mario to rebel against her captors. Her special move makes her explode; this move destroys cracked walls, rocks, and flips switches.
• Parakarry: He is Mario's fourth party member. A Paratroopa mailman, Parakarry joins Mario's party after they help him recover the letters he's lost in Dry Dry Desert as well as other parts of the Mushroom Kingdom. He can carry Mario for a short amount of time, flying over gaps Mario cannot jump. He makes cameos in The Thousand-Year Door and Super Paper Mario as the brothers' mailman.

• Bow is a member of Boo royalty; she holds the Star Spirit Skolar as part of a bargain until Mario takes down the Boo-eating Tubba Blubba and save her subjects. She can turn Mario invisible, which stops enemies from noticing him and protects him from attacks. Lady Bow also makes an appearance in the second game in Poshley Heights with Bootler (her butler) after the player defeats the Shadow Queen.
• Watt is a baby electric spark. She was imprisoned in a lantern by the Big Lantern Ghost of Shy Guy's Toybox, and joins Mario after he frees her. Her speciality is illuminating dark places and revealing invisible blocks.
• Sushie is a Cheep-Cheep and the babysitter of five Yoshi children on Lavalava Island. Her name is a pun on sushi. She joins Mario to find the missing Yoshis. After Mario reaches a dock, he can hop on Sushie and swim on the surface of water and dive. She attacks enemies with water. She also has a daughter named Sashimie (a pun on Sashimi) and a grandchild.
• Lakilester introduces himself as "Michael", before settling on his nickname "Spike", then attacks. After he is defeated, his girlfriend asks Mario not to finish him. Lakilester then joins his party. Mario can hop on his cloud and hover over certain surfaces, like spikes and lava. He attacks by throwing Spiny Eggs.

• Goombella is an aspiring archaeologist. She was one of Prof. Frankly's students and she is the first to join joins Mario to find the Crystal Stars after he saves her from Lord Crump. She attacks by Headbonking enemies, and can use her Tattle ability to find out enemies' weaknesses. In the field, she can give Mario information about characters and places.

• Koops is a timid Koopa. He lives in Petal Meadows, which is being besieged by the dragon Hooktail. He joins Mario to save his town, avenge his father, and prove himself to his girlfriend, Koopie Koo. Mario can launch his shell to retrieve items and hit switches.

• Madame Flurrie: A cloud spirit actress; disillusioned with the world, she retires to the secluded Boggly Woods. When the Punis of the Great Tree are in danger, she joins Mario to save them. Flurrie can breathe winds to reveal hidden switches and disorient enemies, protecting Mario from attack.

• Yoshi is baby Yoshi that the player can name in the game. Mario rescues his egg from a hotdog vendor in the Glitz Pit, and he follows Mario after he hatches. His colors vary depending on what you name your file. Mario can ride him to move faster and flutter across gaps.

• Vivian: The youngest of the Shadow Siren sisters, Vivian is constantly put down by her oldest sister, Beldam, and blamed for anything that goes wrong. Mario helps her recover her sisters' missing Superbobomb, although Vivian is unaware of who he is. When she discovers his true identity, she is at first hurt, but then joins him. Her Veil move hides Mario in the shadows, protecting him from enemies.

• Admiral Bobbery is an old Bob-Bomb sailor. Bobbery retired from the seas after his wife, Scarlette, died, blaming himself for her death. When Mario shows him an old letter written on Scarlette's deathbed, he once again sets out towards Keelhaul Key. Mario can throw Bobbery so he walks forward and then explodes, detonating any obstacles in his way.

• Miss Mowz is the only optional partner. A Squeek mouse, she helps run the Lovely Howz of Badges; in actuality, she is a world-famous badge thief. When Mario completes her quest by finding the secret badge in Hooktail Castle, she joins the team. She can sniff out treasures and other hidden items.

In Super Paper Mario, Mario is assisted by digital fairy-like beings known as Pixls.

• Tippi can reveal hidden doors, stairways, and other objects and examine enemies to discover their weaknesses. She was originally a human girl named Timpani and Blumiere's lover. Because he did not approve of his son's relationship with Timpani, Blumiere's father banished Timpani to another dimension, forced to drift through dimensions till she died. This caused Blumiere's villainous transformation into Count Bleck. Timpani was rescued by Merlon and turned into a Pixl, however she suffered amnesia and lost her memories of her former life. When she encounter's Count Bleck her memories start to restore and at the end of the game she vowed her love with Blumiere, causing the destruction of the Chaos Heart (and seemingly the two lovers). At the end of the credits, it is revealed that Count Bleck and Timpani survived and seen walking into the sunset of another dimension.

• Thoreau can help Mario pick up and throw objects at enemies, or at other obstacles.

• Boomer can be dropped on the ground by Mario, and will explode after five seconds.

• Slim makes Mario become paper-thin. This ability avoids enemies, obstacles, and special holes in the floor.

• Thudley gives Mario and the ability to ground-pound.

• Carrie helps Mario to avoid terrain hazards by carrying him over spikes and water.

• Fleep flips various things using a "magical frame", and reveals hidden objects behind certain markings in the background.

• Cudge enables the use of the hammer. Mario and company can hit objects with this ability.

• Dottie shrinks Mario so he can go into tiny doorways, and run on water.

• Barry is a shield Pixl. If used at the right time, Barry counter-attacks all enemy attacks and projectiles.

• Piccolo's songs can trigger in-game specialties, and cures Mario and company of status ailments such as Poison.

• Dashell lets Mario move at a higher speed than normal.

• Tiptron: Replaces Tippi after she disappears with Count Bleck. Can be bought from Francis for 999 Coins. It believes itself to be the true Tippi, even though it is merely a robot designed to act like her.

Twink is young Star Kid. At the beginning of Paper Mario, he is a newly risen Star Kid and is summoned by Peach when she wishes for help against Bowser. He helps Peach sneak out of her room to deliver the Lucky Star (a medallion allowing Mario and his partners to use action commands) and information to Mario, along with giving him the ability to perform special battle moves. He tries to save Peach from being tied up by Bowser but Bowser simply swipes him away. He returns in the final confrontation and defeats Kammy Koopa while contributing his power to the Star Beam.

Goombario's Family: Goombario has a family that lives in Goomba village. His mother is Goomama, his father is Goompapa, his grandmother is Gooma, his grandfather is Goompa, and his sister is Goombaria. Goombaria discovered Mario after he was beaten up by Bowser in their first battle in Paper Mario and the family help nurse him back to health.

Professor Kolorado: Kolorado is a Koopa archaeologist from Koopa Village. Kooper idolizes him and his wife constantly worries for his safety, since he rarely stays home for very long. Mario and his friends first meet him in Dry Dry Desert, where Kolorado and his team are in search for Dry Dry Ruins. Later, Mario meets Kolorado in his journey to Lavalava Island. During this part of the adventure, Kolorado is obsessed with finding a "treasure" that he believes to be hidden in Mt. Lavalava, so much that he puts his own life in danger and gets himself hurt or in trouble. He finally finds the "treasure" after Mario defeats the Lava Pirahna, but is unable to retrieve it before the volcano erupts. Even though Misstar was able to rescue Mario and Kolorado, Kolorado is saddened that he did not get the "treasure". Later, Mario obtains the treasure from the island and exchanges it for a Magical Seed Kolorado got from a Bub-ulb on the island. He briefly returns home to Koopa Village, but at the end of the game he, Kooper, and his team are in the process of exploring the Crystal Palace when Parakarry arrives to deliver Princess Peach's invitation to Kooper and Kolorado's wife's message to come home. He is last seen in Toad Town with his wife to attend the party at Princess Peach's castle. He is also mentioned in Paper Mario: The Thousand-Year Door, his father was a victim of Hooktail and his remains can be found in Hooktail's Castle with a note revealing Hooktail's weakness.

Koopa Koot: An elder Koopa Troopa that lives in Koopa Village. He is very demanding and controlling, often getting others to do things for him. In Paper Mario he asks Mario to do various favors for him such as giving him common items, to getting items back from friends and getting Luigi's and Merluvlee's autographs. He is last seen at the end of Paper Mario in Toad Town to attend Princess Peach's party.

Moustafa is a mouse who lives in Dry Dry Outpost. He is a descendent of the beings who built the Dry Dry Ruins and it is his duty to see to it that no evil enters. He disguises himself as a mouse name Sheeks. He tests Mario to see if he is trustworthy and gives him the Pulse Stone in order to find and unearth the Dry Dry Ruins.

Yoshi Kids: The Yoshi kids are the children of the Yoshi's of Lavalava Island. They are looked after by Sushie but they often disobey her and explore the jungle. During Mario's visit to Lavalava Island, Sushie asks him for help after the Yoshi Kids disobey her and go off into the jungle. Mario, with Sushie's help, is able to find and rescue all of the children.

Raphael Raven is the guardian of Lavalava Island and the Yoshis sometimes visit him for advice. After Mario finds the Yoshi Kids, the Yoshi Chief suggests Mario to find Raphael for help into Mt. Lavalava. Raphael then leads Mario and Kolorado to the volcano and he commands his squadron of ravens to build a pully into the volcano.

Lakilulu: Lakilester's girlfriend that he tries to impress. When Mario defeats Lakilester, Lakilulu begs for Mario to forgive him. After Lakilester joins Mario's group, Lakilulu promises to wait for his return.

Professor Frankly is a Goomba professor and Goombella's archaeology teacher. During Paper Mario: The Thousand-Year Door Frankly was researching the legend of the Thousand-Year Door. He helps Mario find the Crystal Stars. Near the end of the game, he is kidnapped by the Shadow Sirens and locked in a room in the Palace of Shadow while Doopliss mimicks his appearance in order to trick Mario to open the Thousand-Year Door. Later, Frankly follows Mario and the X-Nauts into the Palace of Shadow and discovers a treasure chest containing a Dried Shroom.

The Black Chest Spirits: Throughout Paper Mario: The Thousand-Year Door, Mario finds large Black Chests with voices coming from them. The speakers of the ones inside the chest tried to trick Mario into opening the chests, claiming that he is a great hero with a pure heart and he is the only one who can hear them. Upon being freed the spirits "curse" Mario with new abilities. These spirits are in fact the four heroes who fought and defeated the Shadow Queen 1000 years previously, but just as they were sealing her away behind the Thousand-Year Door, the queen cursed them, so that when they let go of all the Crystal Stars they would be trapped in the Black Chests. The four heroes included a brave Toad, a Koopa Troopa, a wise Goomba and a Boo girl.

Don Pianta: The head of the Pianta Syndicate (a mafia-like group) in Rogueport. The Don has connections with transportation (such as the blimp to Glitzville and the Excess Express) in Rogueport. He is also a loving father to his daughter, Francesca, and a mentor to Franky. When Mario and his friends need to get to Glitzville, Prof. Frankly suggests asking Don Pianta for help. Don Pianta agrees to give Mario tickets if he helps find his lost daughter and Franky when they eloped. Eventually Francesca and Franky turn themselves in to the Don but he dismisses them, telling them that he didn't care what they did or where they went as long as they never return. For finding his daughter and Franky, Don Pianta gives Mario and his friends tickets. Later on when Mario and his friends need to get to Poshley Heights, Frankly agains suggests seeing Don Pianta. Mario and his friends find the Don ill, desperately missing his daughter, so his cohorts agree to give Mario tickets to the Excess Express if they find Francesca and Franky again. When they go to see the Don, Don Pianta retires from being the head of the Syndicate and asks Franky to take his place.

The Honorable Star Spirits are a group of deity-like beings that reside in Star Haven in the heavens and watch over the Mushroom Kingdom, granting the wishes of the good people using the Star Rod. They also possess the power to neutralize the Star Rod's power should it fall into the wrong hands. In Paper Mario, Bowser stole the Star Rod and captured the Star Spirits, turning them into cards and placing his most powerful followers to guard them. These characters also appear in Mario Party 5.

• Eldstar: The revered elder of Star Haven. His move, Refresh, restores Mario's HP by 5 and FP by 5. He plays a more active role in guiding Mario, he is the one who delivers the message of the Star Spirits' imprisonment to Mario while he is resting in the Toad House in Goomba Village. Eldstar was the first to be rescued by Mario and was being guarded by the Koopa Bros.

• Mamar: The kindhearted, maternal Star Spirit. She can use her move, Lullaby, to put all enemies to sleep. Mamar was the second Star Spirit to be rescued and was guarded by Tutankoopa in the Dry Dry Ruins.

• Skolar: The studious Star Spirit. His move, Star Storm, causes 7 HP damage to all enemies. He was the third Star Spirit to be rescued and was at first guarded by Tubba Blubba until he managed to escape his clutches, but then he got lost in the Forever Forest and was nabbed by the Boos. Lady Bow, the leader of the boos, offers to hand Skolar over to Mario if he helped defeat Tubba Blubba.

• Muskular: The young, muscular Star Spirit that is full of energy. His move, Chill Out, lowers all enemies' attack power by 3. Muskular was the fourth Star Spirit to be rescued and was guarded by General Guy and his Shy Guy army in their Toy Box. He was also the first Star Spirit Twink met in person and Muskular was familiar with Twink, saying that the Star Spirits are familiar with all Star Kids, saying that they were all like one big family.

• Misstar: The flirtatious, sweet Star Spirit. She has a kind, but strong heart. Her move, Smooch, restores Mario's HP by 20. She was the fifth Star Spirit to be rescued and was being guarded by the Lava Pirahna in Mt. Lavalava. After Mario defeated the Lava Pirahna and rescued her, Misstar helped Mario and Kolorado escape Mt. Lavalava while it was erupting. She also scolded Kolorado when he was saddened to not get the "treasure" saying that life is more important than treasure.

• Klevar: The sharp, young Star Spirit that is always seen carrying a book. He freezes enemies with Time Out. He is the sixth Star Spirit to be rescued and was being held by Huff N. Puff.

• Kalmar: A warm-hearted Star Spirit, he dislikes fighting and arguing. His move, Up and Away, turns enemies into stars. He was the seventh and final Star Spirit to be rescued and was being held by the Crystal King in the Crystal Palace.

Jr. Troopa is a young Koopa Troopa. Mario and Goompa stumble into his playground while searching for the latter's hammer. Mario fights and defeats him. To this Jr. Troopa vows revenge. He continually trains for battle and follows Mario and his friends on their journey. They encounter and defeat him on Pleasant Path, Forever Forest, Lavalava Island, Crystal Palace, and Bowser's Castle.

Kent C. Koopa is an enormous Koopa Troopa that used to live in Koopa Village. He is quite greedy and uses Pleasent Path as a toll road for anyone who wishes to get to Koopa Village from Toad Town and vice versa. His name is a pun on "Can't See". His weakpoint is his tail.

Rawk Hawk was the previous champion fighter of the Glitz Pit. Mario and his friends at first believed that he had the Crystal Star they were searching for in Glitzville but as it turns out, the Crystal Star he had was a fake one grafted onto the championship belt. When Mario and his friends make it into the top 10, Rawk Hawk attempts to use underminded ways of making sure Mario doesn't rise in the ranks such as sending threatening E-mails and delivering a poisoned piece of cake. At last Mario and his companions face and defeat him in the Glitz Pit, taking his place as champion. After getting the third Crystal Star, Rawk Hawk gains a new respect for Mario and Mario can rechallenge Rawk Hawk for the championship.

Macho Grubba is a character similar to Tubba Blubba. He is in charge of the Glitz Pit, an arena for fighters. He built a machine, powered by a Crystal Star, to sap the energy from fighters and transfer it into his own body to make him stay strong, healthy and youthful. He used it to make the former Glitzville champion, Prince Mush, disappear when he finds out about Grubba's machine. He hires Mario to be a new fighter, naming him "The Great Gonzales." Jolene, Grubba's assistant, comes to Glitzville to find out what happened to her brother, Mush, and he hires her without suspecting she was spying on him. Mario finds out about Grubba's use of the Crystal Star and faced him. Grubba uses the machine to become a supercharged monster, calling himself "Macho Grubba" and fights Mario. Despite his supercharged strength, he is defeated and reverts back to his normal self. Jolene confronts the defeated Grubba, demanding to know what happened to Mush. He reveals how he made him disappear using the machine, and Mush is returned with the power of the Crystal Star. Jolene takes Grubba's place as promoter.

Cortez is a pirate spirit, still bound to his massive hoard of treasure that he amassed in his life. He stole the Sapphire Crystal Star from the Koopa that was one of the four heroes that defeated the Shadow Queen a thousand years ago. Flavio's ancestors steal a valuable piece of his treasure, the Skull Gem, which was used to power his ghost ship. Mario and his friends journey with Flavio to Keelhaul Key to find the Crystal Star. Mario discovers Cortez's treasure and fights him, but since he is an immortal ghost, he cannot not be destroyed. Since Mario was only interested in the Crystal Star, Cortez gladly parted with it. When Lord Crump and his X-Nauts crew attacked the stranded sailors on Keelhaul Key, Flavio made a deal with Cortez: if he returned the Skull Gem that powered Cortez's ship, Cortez and his crew would help defeat the X-Nauts. Afterwards, he helps transport everyone back to Rogueport and allowed Mario and his companions to sail back and forth between Rogueport and Keelhaul Key.

Kammy Koopa is an old female Magikoopa, and head advisor to Bowser. In the first game, she assists Bowser in the theft of the Star Rod, and creates a machine to increase Bowser's power tenfold. In the second, she merely helps Bowser find the Crystal Stars so he can kidnap Peach.

Goomba King: The Goomba King is a giant Goomba placed in charge by Bowser to keep an eye on Mario and to stop him from reaching Toad Town. Bowser made him grow big using the Star Rod but the king was still weak. He has two minions, the Goomba Brothers. Mario defeats the Goomba Brothers first then defeats Goomba King. His fortress was made from the bridge to Toad Town.

The Guardians of the Star Spirits: After Bowser and Kammy Koopa raided Star Haven, stole the Star Rod and captured the Star Spirits, Bowser placed several of his highest ranking and strongest minions in charge of guarding the Star Spirits all across the Mushroom Kingdom.

• The Koopa Brothers: The Koopa Brothers are four Ninja Koopa brothers, they are an obvious parody of the Teenage Mutant Ninja Turtles. They come in the colors of red, yellow, black and green. They speak in the stereotypical surfer slang just like the Ninja Turtles they are based on. They are loyal to King Bowser and are placed in charge of guarding the first Star Spirit, Eldestar. Their fortress was originally the home of Bob-ombs, who they enslaved until the Bob-ombs attempted a rebellion, forcing the brothers to lock them up. They also attempt to hinder Mario's progress by blocking the exit out of Toad Town to Pleasent Path by disguising as four oddly colored Toads until Merlon uncovers their disguise. They also set up a trap in their fortress to make Mario fall into the same jail they made for the Bob-ombs. In their confrontation with Mario they pilot a robotic version of Bowser, then fight Mario on foot. They have a special attack where they stand each others' shoulders and spin into their enemies. In an ironic twist of fate, when Mario defeats them, they fall into the same jail they had imprisoned Mario and the Bob-ombs. Later Mario gets a letter from the Koopa Bros. threatening to return for a rematch. This almost happens at Bowser's Castle when one of the Guard Doors summons the Koopa Bros. to fight Mario, but are beaten up at the last second by Jr. Troopa.

• Tutankoopa: Tutankoopa is a Koopa Pharoah that Mario encountered in Dry Dry Ruins. He was placed in charge by Bowser to guard Mamar, the second Star Spirit. He keeps Chain Chomps as pets that he overworks. He is able to use magical powers as well. When Mario defeated him, one of his own Chain Chomps turned against him and began chasing him. Even during the credits, he is seen being chased by the Chain Chomp.

• The "Invincible" Tubba Blubba: Tubba Blubba is a reluctant ally of Bowser. He seems to be a giant species of Clubba that lives on Gusty Gulch. In the past Tubba Blubba was scared day and night by the Boos that live on Gusty Gulch and in the nearby Boo's Mansion because he had a timid and sensitive personality. Bowser was able to make him strong and invincible by separating his Heart from his body, in return Tubba Blubba was assigned to guard Skolar, the third Star Spirit. Tubba's Heart is the true Tubba Blubba while his body is merely an empty shell that the heart controlled. Bowser commented that Tubba Blubba was the second most powerful creature he knew (second only to himself). Tubba exacted revenge on the Boos that tormented him by eating them. However, Skolar was able to escape Tubba's clutches. Bow and Mario were able to sneak into Tubba's Mansion and found the key to the Windmill at the bottom of the hill where Tubba's Heart was concealed. Mario defeated his heart, which then retreated to unite with his body, weakening Tubba enough for Mario to defeat him. Tubba resolved that he no longer wanted to be invincible if it meant that he had to fight all the time so he released all of the Boos he had eaten and ran away. Bow then decided that it was best the Boos stopped bothering Tubba Blubba. During the credits, it is shown the Boos were playing keep away with Tubba Blubba's body from Tubba's Heart.

• General Guy: The General Guy is the general of the Shy Guy army. Bowser puts him and the Shy Guy army in charge of guarding Muskular, the fourth Star Spirit. After Mario rescues Skolar, he and his friends return to Toad Town to find it overrun by Shy Guys. who go on a thieving spree, stealing various important items from the inhabitants, such as Russ T.'s dictionary, Rowf's calculator, the Post Office's mail bag and Tas T.'s frying pan. Mario finds their hideout in the Toy Box and gets back the items the Shy Guys stole from the Townspeople and rescues Watt from one of General Guy's minions, the Big Lantern Ghost. General Guy finally faces Mario and sends hordes of Shy Guys to battle him before fighting him in his tank. Mario is victorious and rescues Muskular. Afterwards the Shy Guys quit their mischief-making and at the end of the game the Shy Guys befriend Watt.

• Lava Pirahna: The Lava Pirahna is a giant species of Pirahna plant that is able to survive in lava. It commands the Pirahna plants in Mt. Lavalava and possibly all of Lavalava Island. Bowser places it in charge of guarding Misstar. Mario defeats it and rescues Misstar.

• Master Huff N. Puff: Huff N. Puff is a giant cloud monster that commands Puffs and squads of Lakitus, including Lakilester before he decides to join Mario instead. He invented a device to turn Flower Fields into a cloudy place making it unsuitable for the plants that live there. Bowser put Huff N. Puff in charge of guarding Klevar, the sixth Star Spirit. When Mario fought him, whenever Huff N. Puff was damaged, smaller Puffs popped out of him, making more enemies for Mario to fight. The Tuff Puffs not only provide backup for Huff N. Puff, Huff N. Puff can also swallow the Tuff Puffs to regain his HP. In the end Mario defeated him and got back the Star Spirit. During the credits, the Yoshi Kids eat some of Huff N. Puff and Gourmet Guy is seen chasing him.

• The Crystal King: The Crystal King is a monster made of crystal ice that took over the Crystal Palace in the Shiver Region. He commands several Duplighosts. Bowser places him in charge of guarding Kalmar, the seventh and final Star Spirit. He sought to defeat Mario and present him as a frozen gift to Bowser but he himself was defeated and thus Mario was able to rescue all seven of the Star Spirits.

The X-Nauts: The X-Nauts are a group of Extraterrestrial beings that seek to conquer the world in Paper Mario: The Thousand-Year Door. They are lead by Sir Grodus and their headquarters is stationed on the moon. At the end of the game they are seen regrouping and retiring from doing evil.

• Sir Grodus: The leader of the X-Nauts, the invading aliens who seek to conquer the world; he uses a potent mixture of magic and technology to achieve his dark desires. Grodus kidnaps Peach from Rogueport and sends his minions to steal the Crystal Stars from Mario. He ultimately offers Peach as a host for the Shadow Queen, but the newly reborn demon simply blasts him to pieces with her dark magic. It is later revealed that he survived as his disembodied head.

• Lord Crump: One of the higher-ranking X-Nauts. Crump is an evil but buffoonish figure, often bungling his missions through sheer stupidity and incompetence. Like Grodus, he has an odd laugh, and his catchphrase is "And with that, POW I'm gone!" and is one of the few characters that breaks the fourth wall.

• TEC: A highly-advanced computer created by the X-Nauts. At first, TEC is blindly devoted to Sir Grodus, but begins to doubt his alliances after developing feelings for Peach. During her captivity, TEC allows her to escape her room and enter his terminal; in exchange for teaching him about the X-Nauts true motives, as well as love and emotion, TEC sends her messages to Mario. Grodus eventually discovers his treachery and has him shut down, although TEC uses the last remaining vestiges of his power to teleport Mario to Rogueport and destroy the base. In the end, it is revealed he somehow survived the blast, supposedly through the bond he shared with Peach.

The Shadow Queen was an ancient demon who conquered the world years ago. She commanded many monstrous forces, including the three dragon siblings: Hooktail, Gloomtail and Bonetail, and created the Pit of 100 Trials as a dungeon for those she punished. She also created the Crystal Stars to increase her power and to command the power of the heavens, but was later sealed by their power thanks to the endeavors of four brave heroes. Locked in her Palace of Shadows behind the Thousand-Year Door, the only way to call the Shadow Queen back to the world was through the use of the Crystal Stars and a new physical form. Grodus offered her Peach for this purpose, but Peach broke free of her influence; the power of people's wishes through the Crystal Stars weakened her, allowing Mario to triumph.

• The Shadow Sirens: The Shadow Sirens are a trio of shadowy sisters that have allied themselves with the X-Nauts. Like the Axem Rangers in Super Mario RPG and the Koopa Brothers in Paper Mario, they seem to be parodies of characters from popular culture, this time the Weird Sisters from Macbeth. Vivian was once part of this group until she went with Mario, after she left Doopliss joined. As it turns out, the Shadow Sirens were serving the Shadow Queen and spread the rumor that a great treasure lay behind the Thousand-Year Door underneith Rogueport.
  • Beldam: The oldest of the three sisters, she resembles a stereotypical witch with a long nose and pointed hat. Her element is ice. She often mistreats her sisters, especially Vivian, and threatens to punish them when their plans go awry. She also often blames Vivian for her own mistakes, such as losing the wanted portrait of Mario and a bomb. When she first sees Mario's picture, Beldam comments on how handsome Mario is. When Doopliss joins the Shadow Sirens, she begins to disrespect him as well, calling him "Freaksheet".
  • Marilyn: Beldam's younger sister, she is actually the strongest of the three, her element is electricity. Goombella describes her as being the "strong silent type", she doesn't speak in the game, saying only "guh".
  • Doopliss: A duplighost that lives in Creepy Steeple and was also in possession of a Crystal Star. He cast a curse on the people of Twilight Town, every time the bell in the steeple rang, one of the villagers would turn into a pig. Mario and his friends went to Creepy Steeple to put an end to the curse and to get the Crystal Star and fought Doopliss. During their battle with him, Goombella was unable to identify him since his name at the time was unknown. During the battle Doopliss mimicked Mario's appearance and stole his name and body causing Mario to become a shadow of his former self. Doopliss, as Mario, attempted to get rid of Mario for good by challenging him to guess his name. Vivian helped Mario find the identity of his enemy by sneaking underneith Creepy Steeple to find a parrot that knew his name and was being held there. When Mario guessed Doopliss' name, he lost his power and Mario was able to regain his body and name back. Later, Doopliss impersonated a famous celebrity toad to board the Excess Express while stealing ingredients for a special bomb. He teams up with Beldam and Marilyn to stop Mario in the Palace of Shadows and flees after the Shadow Queen is defeated. At the end of the game, Goombella reveals that Doopliss turned to the side of good and joined a theatre troupe with Flurrie.

• The Dragon Siblings: During her reign, the Shadow Queen had three dragons as pets that spread terror throughout the world, they were Hooktail, Gloomtail and Bonetail. Hooktail was a red dragon and the youngest of the three and was also the only girl (although some of the other characters refer her as a "he". Her gender was revealed when Gloomtail referred to her as his sister). Hooktail was gluttonous in nature and resided in Hooktail Castle where she would sometimes leave and feast on the friendly Koopas in Petalburg. She ate the first Crystal Star as well as Koops' father, for this Koops vowed revenge (Kolorado's father is also revealed to be one of her victims as his remains are found in the Castle with a note revealing her weakness). Hooktail was also renowned to have pleasent smelling feet and claimed that many would pay to smell them. She gets sick whenever she hears a cricket chirp (her weakness is described as something that "starts with "c" and ends in "ricket"). A badge in Hooktail Castle allows Mario's attacks to sound like a cricket chirping and is able to weaken her. Also when Hooktail is on the verge of defeat, she will try to trick her opponents to be merciful. Mario and his allies storm Hooktail Castle and defeat her, forcing her to regurgitate Koops' father (who managed to survive being eaten by curling into his shell) and the Crystal Star. Later when Mario and his friends open the Thousand-Year Door and enter the Palace of Shadow, they encounter Gloomtail, Hooktail's older brother. He is a black and purple dragon who, after hearing that Hooktail was defeated, vows revenge, but he himself is defeated and regurgitates a key to another part of the palace. The last dragon, Bonetail, is found in the lowest part of the Pit of 100 Trials. He is the oldest of the three, so old in fact that he was reduced to a skeleton. He is also the strongest, said to be the strongest boss in the game, even more so than the final boss (the Shadow Queen). After Mario defeats him, he regurgitates a rare badge.

Count Bleck: The presumed main antagonist of Super Paper Mario. His name is a pun on the words "Blech" and "Black" and his face strongly resembles the faces of the Black Chest spirits. He, through Bowser and Peach, tried to use the Chaos Heart to devour everything in existence. He was later revealed to be Blumiere, the former lover of Tippi's old embodiment, Timpani. He later releazes the error of his ways and destroys the Chaos Heart by marrying Timpani.

• Nastasia: Count Bleck's loyal assistant. She brainwashes people into obeying Count Bleck, and does successfully with Princess Peach, forcing her to marry Bowser and Luigi, turning him into Mr. L. She is shown as having romantic feelings for Count Bleck, but knows she will never be loved by him the way she loves him.

• Mimi: One of Count Bleck's minions. She has the ability to shapeshift, and she uses it to confuse and defeat Mario on a number of occasions before finally being defeated some time later.

• O'Chunks: A former general who lost his world and army after being stabbed in the back by his advisor. O'Chunks is a powerful but lack-witted warrior who, despite being aligned with Count Bleck, follows a code of honor and follows Bleck loyally.

• Dimentio: The true antagonist of Super Paper Mario. He has the ability to travel throughout, and send others to other dimensions. At first he is seen as playful, but is then revealed to be a completely evil, and psychotic being. He can also create his own dimension, which makes his powers 256 times stronger. He always has a smile on his face, even while doing his evil deeds (a true gesture of insanity).

• Paper Mario (series)
• Paper Mario
• Paper Mario: The Thousand-Year Door
• Super Paper Mario