We couldn't leave our 360 fan out in the cold when it comes to the best fan boy costumes, so we had to do a special for Xbox 360 games as well. Of course, I know some of these are cross platform, but they're still pretty damned popular on the 360. Think you know who you'll see? Read on to find out!

6. Portal: Still Alive
This costume celebrates the release of Portal onto the Xbox Live Arcade. Many a gamer has gotten stuck in both the original and the challenge levels, and of course, the cake is a lie. GlaDOS' Still Alive song is perhaps the best known gamer song, aside from the Super Mario Bros. diddy. Awesome job on the Companion Cube!

5. Gordon Freeman
Gordon Freeman has inspired a generation of gamers to wield crowbars and black rimmed glasses. The Orange Box was perhaps the single most successful launch in Valve's history, and we've still got one more episode to go!

4. Altair
Assassin's Creed has really revolutionized the meaning of interactive environment, and this fan boy's pose is a great example of the game. I feel really sorry for the guy in black. No, really.

3. Big Daddy & Little Sister
This is a stunning example of fan boy and fan girl dedication. While the Little Sister isn't as scary as her counterpart in the game, the Big Daddy is spot on. Now, would you kindly step away from the Little Sister.

2. Marcus Fenix
There's nothing like executing your enemies with a nice curb stomp. Aside from all the blood and gore, this costume is really put together, and it looks like the entire Delta Squad is represented. Go COG!

1. Master Chief
What really can be said? We feel sorry for the guy who disturbed the Chief while he was in the loo.