Matthew Doniel, called The White Tiger, actually a son of the Vipers' leader. Second son, to be precise. He has several piercings and lots of tattoos. He's 21. He has spikes drilled into his knuckles on both hands except for the thumbs. (inspired by Paolini there )
Matt is cheerful, cheeky, rude, kind of happy-go-lucky, but with a sarcastic attitude. He can be serious though, when the situation requires it. He is not a morning person.

On a side note: I saw a boy once in a bus that looked exactly like Matt here. well, okay, leave out the tattoos and piercings and the boy had dark hair instead of blonde. My point is that the facial features were exactly the same. Needless to say the boy had to wonder why was this strange girl staring at him and grinning like an idiot XD