(First off, character design heavily influenced by Rocket Raccoon. Keep that in mind.)
Jet is an anthropomorphized feral raccoon, given sentience and unnatural strength through genetic modification and cybernetic enhancement. He stands at a whopping three feet tall but has the strength of a hardcore bodybuilder without all the bulk. He can usually be found either grooming himself or playing games on a small handheld device, all of which involve obscene amounts of violence. On occasion he also watches videos on his headset (which looks like green-tinted shooting glasses with an attached microphone) while cleaning a surprisingly large gun that fires bolts of energy instead of bullets.
As far as looks go, he's quite small, wearing a leather jacket and cargo shorts held up by a thick belt and tied shut just below his knees. He wears no shirt or underwear and he leaves his jacket open to show off his fur and a small amount of cybernetics lacing along his ribs through his fur. He has bright green (almost glowing) eyes, the aforementioned shooting glasses, a green stripe down the length of his fluffy tail, and a sizable chunk taken out of his right ear from a stray bullet.
(Anything else you'll have to find out on your own, lazy punks. Ask questions, investigate! I''m not doing all the work here.)