Pyro Bison

Pyro Bison (パイロ・バイソン) is a member of Black Chamber and a pyromaniac who is obsessed with his flamethrower, despite it being a less effective and more cumbersome weapon. He wears a custom body suit made of flame-proof material lined with ceramic plating, and uses a special blend of fuel which he states burns more purely and fiercly than any other flame; together, the suit and fuel tank weigh at least 300 lbs., indicating that he has considerable strength. A considerable amount of his body is covered in disfiguring burn scars, though how exactly he obtained them is unknown.

Unlike other members of Black Chamber, he doesn't reveal any details about his past. Instead, when defeated, he accuses Snake of being a sinner, commenting on how many he's killed so far on this mission, and reveals the history of Black Chamber and its relationship with FOXHOUND. He then expounds on his belief that fire cleanses both sinners and the innocent and is engulfed in flames as his fuel tank explodes, dying while crying out in seeming ecstacy.