Past shrouded in mystery, the only relations are his younger sister that he abandoned, his father he tried to kill and an old teacher he decided had become weak, this man became cruel and bloodthirsty but it is unknown why he became like that, it's possible it had something to do with his mother dying when his sister was young in age but all we know is that is who he is now, now that he's met Takasugi, his path is set to collide with Gin and Kagura again, only time will tell what his future might hold.