Sheen is not the sharpest knife in the drawer. Sheen is obsessed with a superhero called "Ultra Lord". He collects all the Ultra Lord action figures, cards, and quotes him daily. Sometimes, Sheen can be somewhat insensitive and miss the big picture of things. Sheen is 13 years old (he got held back a few times as mentioned in "Operation Jet Fusion"). Despite worshipping Ultra Lord, it is actually shown that he cares about his father and Libby most of all.