Ren Hiyama is a murderer having knowledge of the human mind
He's a hypnotist able to control its victims 
To change their personality by shaping them as he wants 
He also has the possibility of obtaining informations from his victims thanks to his therapy by bringing up burried memories before making them lose their memory
He commits attacks against the governement using his guinea pigs before making them commit sucide
His goal is to become the Master of the world