Gunner/defender within the Chainsaws, who likes shooting innocent people more than most others. He was sold at age seven to the yakuza by his father, to pay off gambling debts. They put him into an underground brothel where he grew up heavily abused; the experience warped his mind considerably.
As soon as he was old enough, he slipped his chains. After brutally murdering a client at the brothel, he stole whatever money the man had and escaped to America by buying his way aboard a freight ship. In San Francisco, he joined up with another yakuza fraction. By then, he'd acquired a taste for blood--and other things--and they put him to good use as an assassin.
When the Moribund hit, his gang was wiped out but that paved the way for Asahi to finally gain independence.
None--he only needs his trusty rifles. And knives. And teeth. And nails.