Wilt is an imaginary friend, as are many imaginary friends in Foster's house. Foster is a friendly grandmother who runs this shelter. it is something like a shelter, but with conscious personalities of different kinds.
His creator, Jordan Michaels, didn't play basketball very well, so he created Wilt. With Wilt's help, Jordan became invincible. For a whole year they were unstoppable. However, a jealous boy created an imaginary friend of Foul Larry, a giant with a basketball head. Jordan and Wilt met them and they led 48-47 until Larry went for the last throw. Wilt was ready to defend himself, but Jordan was right under Larry when he jumped. Wilt, postponing victory, rushed forward and pushed Jordan out of the way just as Larry fell, saving Jordan's life, but breaking Wilt's left arm, leaving it bent. The ball went through the basket and knocked out his left eye, bending it into its current shape. It is still unknown how he got his scars, but they could have been obtained during his journey in search of a place to stay, which eventually turned out to be Foster's, or how he actually lost his arm. Jordan was so upset by the loss that Wilt ran away, distraught. It wasn't until the State judge told Jordan what had happened that he went looking for Wilt, but all he found was a bracelet from Wilt's broken arm. Jordan became a professional basketball star.
Wilt prides himself on finding abandoned imaginary friends, making him a "helper friend", and he is obnoxiously kind, sometimes apologizing a lot even when he doesn't have to. he just can't say no, especially when someone asks him to do something, even if it's incredibly inconvenient.
For example, he missed an entire basketball game while doing favors for everyone who saw him, including thugs. Although he was unable to say "no" in this episode, he said it twice before admitting he couldn't say it, and has also said it many times in other episodes, even ones made before this episode. Blue's laziness and idiotic attitude sometimes cause him to take advantage of Wilt's favors by pretending to be sad or hurt.
he is an excellent dancer, but tends to get nervous in front of large groups, as seen in the County Imaginary Friends talent competition, resulting in him stuttering and becoming too frozen with stage fright to continue. Wilt had also hosted the competition the previous year, apparently forgetting his lines and causing something terrible to happen, but after he messed up the last time, Madam Foster says, "It was much better than last year."

Wilt has red skin and stitches on his left arm and the sides of his face. His left eye stalk is crooked while his right eye stalk is fine. He has a right hand that is usable. His left arm is short, but Wilt can move it as well. He also has two long legs, for a total of four limbs. He usually wears the number 1 on his chest like a basketball jersey, a single bracelet on his right arm, white long tube socks with red and blue trim, and black and white basketball shoes that make his steps creak like a basketball court when he walks. has many friends in the Foster house. He sleeps under the bed without a blanket, as he prefers someone else's comfort to his own.