The most interesting people from each military theater:

Europe: Manfred von Richthofen
Middle East: Wilhelm Wassmus
Africa: Paul Lettow Vorbeck
Asia and Pacific: Herman Detzner

Lawrence of Arabia of each country:

Britania: T. E. Lawrence
Germany: Wilhelm Wassmus or Oskar von Niedermayer
Austria-Hungary or Czech lands: Alois Musil

Persia (A state that was neutral and yet fought on its territory) from each military theater:

Pilar Millán Astray

Naulila Incident

Swedish volunteers in Persia

Battle of Ambos Nogales

Termination of the German and Austro-Hungarian Legations

Austro-Hungarian concession of Tianjin

North-West Frontier Theatre of WWI

Chilembwe uprising

Koopinator