Katana

Katana is the main anti-hero or antagonist it depends on the situation, he works as a man for hire and lives in a garage level of an abandoned building on the edge of a junk yard in Night Town.

He is a sociopath, though he is not as evil everyone thinks he is.

Katana is the main reason why the Hajiki recieves his gad guard, though it was Katana's intention to take the gad guard cube for himself but his plan failed. Though it doesnt stop Katana from trying to destroy Hajiki at any point the anime, near the end he even tries to attack Hajiki's family to lure him to turn over his gad guard.