ᕼᗩᖇᑌ ᔕᑌᘔᑌKI ᴬˢ

He can transform any part of his body into a weapon (of any kind) for his technician.

Naoki Kashima: Technician/Friend
CC: Dear friend
Charlie Emily: Enemy friend
Whitley Sparda: Who the f*** is this b**** (he doesn't like him very much)

After an argument with his friends, he goes home to find his family murdered, apparently by a thief. He goes after the thief, noticing a man fleeing, and begins to chase him. Once he catches him, in a fit of rage, he beats him to death. Taking the man's wallet and seeing a photo with his family, he begins to reflect and regret his impulsiveness in killing that man.

Back in his hometown (having escaped the consequences of witnessing his family's murder), he kills those who once made his life a living hell. The rare disease his mother inherited ravaged him until his fateful death. He walked slowly through the snow, weeping and sobbing, until he finally succumbed to the same illness, his lifeless body gently covered by the snow on the cold ground. Upon arriving in Hell, he encounters his now-Technician, Naoki Kashima, better known as "Demi-Fiend" or "The Hitoshura," and later Charlie Emily, forming a temporary alliance when he sees she is unarmed.

She wears a white vest with a long collar and a long bottom that reaches her knees, a shirt and trousers, along with black shoes.

He looks like a boy of about 16-17 years old with snow-white skin and red eyes, his hair is as black as coal.
He's tall, I suppose about 1.74 meters.

He's someone who gets angry easily and is quite irritable; he's often called a Tsundere. He's not very kind or empathetic, usually only caring about himself. He's quite egocentric and can sometimes even be sadistic, and he can be quite impulsive at times.