Jinn Geneham was the fake leader of the League Militaire, but despite this he enjoyed acting like the real leader. Uso Ewin develop a distaste for him after his first encounter with the fake leader was when Jinn sustained a minor injury in battle and got mad at the lack of prompt medical assistance from his men.
Eventually, Jinn is revealed as a fake and cover for the real Jinn Geheman, Uso Ewin's father Hangelg Ewin. After Hangelg revealed himself and began rallying the League Militaire forces, Jinn began commanding attacks against the Zanscare Empire in order to assert his control over the League Militaire.
Later, during the battle to destroy the Zanscare Empire's ultimate superweapon, the Angel Halo, Jinn orders the Reinforce Junior to ram the Zanscare's Adrastea-class. His men all choose to stay on board to go along with him and sacrifice themselves along with him to destroy the battleship.