 Kinnikuman Soldier was first introduced as an army-themed Choujin named Soldierman who was chosen by the God of Brutality to become Kinnikuman Soldier.However, the Kinnikuman Soldier who appears for the majority of the series is actually Ataru Kinniku, Kinnikuman's long lost older brother.Ataru had walked out of the Kinniku clan after becoming fed up of his spartan training.