I'll join! This seems like a good idea.
Race: I'd like to keep this secret for now, heeheehee...
Mental Affliction: Contentment. Anything that happens is fine by him. Insults whistle over his head. However, he's literal-minded and obedient, as well as trained to kill. This represents an unstoppable killing machine that doesn't care what happens to it and in fact enjoys challenges and easy jobs exactly the same.
Bio: He was caught and sent to this institution after a failed attempt on the life of a cruel dictator on his home world. Even the messed up ruler could see he needed help and sent him to the institution, bundled up in duct tape and smiling contentedly at everyone. By the second day, his nurse was found dead, and after that, his food deliveries were under armed escort.
Pic or description: He has startling blue hair and pale skin. His teeth are slightly pointed at the edges, and he's a humanoid of naturally average height and build.
Any Extras you'd like to add: He's a luckyducky. Everything is done based on instinct, which is nearly always correct to the point where it's impossible to predict his actions except for the fact that they'll turn out for the best. His favorite weapon is a katana that folds up into a small dagger.
Fears: His only fear is marks that are too hard for him to handle. Other than that, he welcomes everything as lucky. It's like super-optimism... O.o