Billy Lee Black is a character from Xenogears.
Billy hangs out at the Ethos Institution, which preserves culture and excavates equipment from ancient ruins, especially huge, humanoid mechanisms called Gears.
He turned to a life of religious calm after several childhood events. His father Jessie deserted Billy, his sister Primera and their mother. Worse yet, his mother died a gruesome death at the hands of some phantoms called Wels. Billy takes up the cause with Fei and Bart.
Billy is the resident gunslinger in the pack and is the only character able to equip and fire guns. The bigger the gun, the better!
Billy's Gear is Renmazuo.