just not sick, sicko.
Besides the famous Metroid killer, you can find some other serious cosplayers with some amazing outfits at Marcelo Colin's flickr page. Altaïr of Assassin's Creed, Hellboy, and some random Darth all make appearances.
-- "My name is Domino Harvey. I am a bounty hunter. You're probably wondering how a girl like me arrived here. What I say will determine whether or not I spend the rest of my life in prison."