Plug; Monday Night Combat is one of the best multilpayer games out there right now. For a measly $15 you get a deep mix of tower defense, 3rd person shooter and class based team game. Check out some vids on youtube and give the demo a shot on the 360 arcade.
This is one of the background characters, Pitgirl. Totally infatuated with the game (and her I guess ;P) so I had to draw something up.