Wilt

Wilt is one of the main characters from the animated series,. He is an overly-nice, super tall, basketball player, who used to be the imaginary friend of a boy named Jordan Michaels.

In "A Lost Claus", he and the other imaginary friends were overjoyed to be spending their first Christmas with Mac and Bloo. Wilt helped Bloo prove to Mac, the existence of Santa. Wilt sat in a sleigh, being pulled by the alicorn imaginary friends. Bloo did this to prove that Santa could fly around the world in one day, under those conditions, but Wilt didn't know what exactly he was doing, until after Bloo already sent him off. Wilt was gone for the entirety of December 24th, but miraculously returned on Christmas day, explaining that Bloo's theory was true and he did go all the way around the world.