Boma was once an inmate at a prison where the worst offenders are genetically altered to look like a beast. His real face is that of a Werewolf , and he uses a hologram mask for his human face.
Boma was once an inmate at Magnagalia prison where inmates who are sentenced to more than 100 years are forced to undergo genetic modification to give them the face of a beast, so that they never forget the crimes they have committed. Boma is referred to as a werewolf but in reality his wolf face is now his real face and his human appearance is achieved through the use of a holographic projection mask. Having escaped from the prison where he was serving a life sentence for murder he shows up in Judoh looking for his bunny. His bunny is his younger sister that he lost contact with when he went to jail, and he goes up to random women on the street and asks them "Are you my bunny". When we meet Boma we are shown flashbacks of his past where he, his close friend and bunny were supposed to escape to Judoh together but his friend betrayed him and Boma went to jail. The details of this incident are not fully revealed until later in the series and because of the torture he suffered in prison Boma does not seem to remember them clearly himself. He is also constantly tortured by images/ghosts of bunny and his friend who constantly mocks him. Suffice it to say that the betrayal he suffered has given Boma a deep resentment people. He travels alone and trusts nobody and does not believe there is any good in people. He works as a mercenary and in episode 4 he is hired by the mafia to find and destroy J.
He is a skilled fighter and an incredible swordsman and his sword is his weapon of choice. He is extremely fast and sometimes moves so fast as to appear invisible. Being an illegal and an except convict he spends most of his time hiding in the Underground and it is here we discover that he obtained his holo-mask.