Leo is a trooper serving in a futuristic military system as part of Squad 16422, alongside comrades Grey, Nova, Hawk, Sky, Tures, and Tim. He possesses distinctive white hair and black eyes. Deployed with his squad to Area 807 in western America, Leo survives the initial combat engagement, emerging as one of only three survivors alongside Grey and Nova after the rest of the squad is killed. Leo later dies during a confrontation with enemy tanks while attempting the perilous 1000-kilometer journey back to the demilitarized zone with Grey and Nova.