Wilt is a very nice, caring imaginary friends and is the one who helps out the most around the house. Somewhat of a yes-man, Wilt has been manipulated by some to do many things, even helping criminals to complete a crime scene (only to wind up in jail after realizing what he had done, and later helps the same criminals escape). He has been tricked by Bloo a few times during the series' earlier seasons, but has even outsmarted Bloo himself on rare occasions. He is the most friendliest person in the house, and is willing to help anyone in need, despite only having one arm which makes the tasks even harder to do. He has only one arm due to a basketball incident which resulted in a Basketball friend landing on his left arm, causing the ball that he was about to throw to bounce off of the wall and hit his left eye, which in return causes the pupil to wobble around his eyeball (resulting in it resembling a Googly Eye). Wilt's friend imagined him being red, having sports gear on, having snail-like eyes, and a number on his chest that reads 1.
Wilt is a red stuffed toy like imaginary friend, he has a long right arm and lost his left arm, Wilt has also snail like eyes (his left eye is completely damaged to make it look like a googly eye) and a blue colored number one, and has long legs and wears black and white sneakers, his eye color is confirmed to be brown.