Bunji Kugashira earned the nickname "Madness" for his skills as a killer. He is an expert both with guns and unarmed. He also has a strange sense of morals. He deems it fine to kill others as a hitman, but he has a strong sense of loyalty to his friends and coworkers.

Bunji first meets Harry MacDowell on a job to kill him. Harry tells Bunji that he is being used, and both men confirm it. Although Harry wants to recruit Bunji for Millennion, it is actually Brandon that persuades him to join. Brandon beats Bunji in unarmed combat, and Bunji has considered Brandon a close companion ever since. Bunji calls a lot of people "brother," but there is a sense that he truly means it when he calls Brandon that. It is this bond that makes facing Grave so difficult.