Kiyomasa "Crow" Senji
About
He seems to thoroughly enjoy violence, and his favorite phrase is "Dead Center." Despite his wild and battle-hungry attitude, he does have a sense of honor and respects strength and determination. In an ironic twist, Senji becomes flustered and embarrassed when a woman acts immodest. When he first notices Shiro's form fitting body tights, his face becomes red and he give her his coat telling her to quickly cover up.
His Branch of Sin is called "Crow Claw." It manifests as two large scythe-like blades, made of blood, extending from long cuts on his forearms. He makes these cuts using two bladed rings he wears on his thumbs. While the blades are typically two to three feet long, Senji has demonstrated the ability to greatly lengthen them allowing him to attack people at range. He is responsible for naming Ganta's 'Branch of Sin' (Ganta Gun). He also has a supersonic attack called Invisible Black.
Senji used to be a policeman before his time in DW. It's hinted that he killed four friends.
It's revealed in his fight with a Forgery that Senji did not kill them, but was indirectly responsible for their deaths. After the Tokyo massive earthquake, chaos ruled in Senji's inspection area, and out of the corrupt police force, only Senji and his friends were active against the local crimes. Their actions soon drew hostile attentions of many hoodlums, especially to Senji since the branch of sin he possessed was a powerful asset. They challenged Senji to a many-on-one battle, but his friends stopped him and took on the offer, and ended up savagely murdered in his place. As such, he partially believes Ganta in that he did not kill his friends, because he has experienced similar circumstances.