Shira has worked as a mercenary since the age of sixteen. This is likely to have caused his sadistic nature and love of killing. Taken from death row, he was recruited by Habaki to work within the Mugai-ryu.
Shira is twisted and sick. He enjoys torturing and raping women, and will never kill a woman without attempting to catch her alive first.
Among the many he has killed, Shira notably raped and murdered O-Ren, the prostitute girlfriend of Ittou-Ryu member Taito Magatsu, leaving Magatsu with a personal vendetta against him. He attempted to kill another prostitute who was paid to disguise herself as Anotsu Kagehisa (posing as a woman) and maimed her, cutting off her leg and slicing her breast while assaulting her. He shows his sadistic side to Rin after killing a dog she had befriended, and later attacking the said prostitute in front of her. He also punches Rin in the face when she tries to stop him.
Magatsu and Manji team up unexpectedly after awhile and confront Shira for the first time since his Mugai-Ryu days. He had since carved the bones of his missing arm into claws. Magatsu tells Manji to stay out of the fight, and he and Shira fight a long battle, ending with Shira hanging off a cliff. Magatsu cuts his remaining hand off, making him fall and is then presumed dead.
Shira had been imprisoned after his fall and experimented on. In prison he met Renzo, the young teenager whom Rin had befriended during a festival in volume 4. Shira abused Renzo and made the boy work for him. Shira was one of few subjects to survive the immortal experimentation. After this process, however, Shira lost the ability to feel any pain.
Later, he manages to kidnap Rin in an intricate plot to fight Manji, stripping most of her clothing and tying her wrists to a dock, her body suspended in a freezing winter pond. During his fight with Manji and Magatsu, Shira alludes that he sexually assaulted Rin as he had with O-Ren, and killed them, leaving both Manji and Magatsu in insatiable rage. It is never shown if Shira really assaulted Rin or just said he did to piss Manji off.
With Manji's limited help, Magatsu is finally able to permanently subdue Shira, leaving him on the verge of death shortly before wild dogs finish him off.
Relationships to other charactersEdit
Weapons and fighting skillEdit
Shira starts out with black hair, but after losing his arm and carving his bones into blades, his hair turns white.