He admires Mikey (Sano Manjiro) yet wants to kill him. He accidentally killed his brother (Shinichiro) and to cope with it, his mind blames Mikey, using his common phrase "Everything's Mikey's fault." Or similar.
His special ability is taking nails out from people.
He's currently in the gang Valhalla, and hates Toman members. 
He was an old member of Toman, one of the 6 founders, along with his old buddies Mikey, Baji, Draken, Pah-chin and Mitsuya, until the accident happened. 