"Most test subjects do experience some, uh, cognitive deterioration after a few months in suspension. Now you've been under for...quite a lot longer, and it's not out of the question that you might have a verrry minor case of serious brain damage."
-Wheatley

Wheatley is an Aperture Science Personality Construct (or personality core) that serves as the humorous deuteragonist for much of Portal 2. I can't say much more about him without spoilers, but I will say that he's hilarious and great. I would highly recommend the game, as would most of the known world.
This is my take on him as a humanoid. Enjoy!