K

The mysterious sorcerer that can grant any wish except the restoration of live. Once a person looks at him, they cannot leave until they make their wish, or they die. His name remains unknown since he said there is a curse attached to his name. He also grants wishes to live, if he doesn't fulfill a wish, no matter how selfish it could be, he'll die. Though K is a cranky, cold individual when he grants wishes they tend to, in the end, result in good rather than hurt. Regardless of who heartless he seems if he makes a mistake with his power he'll take utmost responsibility to atone for it. Unknown to Ryu Jin, her brother was K's teacher. K is apart of the same race as Yuri, meaning that when he falls in love, when his love dies, his heart will ultimately burst. Because his race assimilates to who they love, in volume 6 K's beginning to become more human (such as, his hands are no longer ice-cold and he can get colds). -- Wikipedia