What is a cool one-word nickname for a boy (read desc)?

Well, I'm writing a story. It must be a cool, modern nickname optionally sounding cute with Robyn. He has blackish-blue hair, steel grey eyes, he has a two silver studs on his earlobe and three silver hoops going up the top side of his ear (this is his right ear). He always wears a necklace (silver) with an angel holding a spike downwards. He is seriously cute, is sometimes a jerk, but mostly kind and cracks jokes alott. I've been thinking about Hunter, or Werewolf - if you'd like to, please comment on those nicknames too!