Angel

A nightbreed who appears in episode 10, "Tears of an Angel". Although he initially looks like a handsome young man, his true form is extremely hideous. When it was revealed to his current human, a girl named Yuki, he expressed a desire to continue being with Yuki, attacking her when she resented him because of his form. He usually preys on individuals lacking in self-esteem (this is somewhat ironic, as Angel himself didn't wish for Yuki to forsake him, hiding behind his angel form).

(Source: Wikipedia)