Foster's Home For Imaginary Friends

According to Wilt, there are different kinds of Imaginary Friends: * Extreme-O-Sauruses - Dangerous and destructive imaginary friends that are imagined up by jerky teenage boys. * Imaginary Friends with Horns - Represented as a Unicorn. * Imaginary Friends with Wings - Represented as a Pegasus. * Imaginary Friends with Horns and Wings - Represented as a Flying Unicorn. * Imaginary Friends with Horns and Wings that Talk - Represented as a Flying Unicorn that talks. * Simple Imaginary Friends - Represented as a stick figure. * Stealthy Imaginary Friends - Represented as a walking door. * Two-In-One Imaginary Friends * Unimaginary Imaginary Friends - Represented as Mojo Jojo as these types are Imaginary Friends that are made from kids who aren't creative. * Furry Imaginary Friends * Fuzzy Imaginary Friends * Fluffy Imaginary Friends * Funky Imaginary Friends * Big Imaginary Friends * Small Imaginary Friends * Young Imaginary Friends * Old Imaginary Friends - Represented as Mr. Herrimen. * Happy Imaginary Friends * Sad Imaginary Friends * Good Imaginary Friends * Bad Imaginary Friends - Represented as Duchess. On a related note, Bloo classified Coco as a Silly Imaginary Friend, Eduardo as a Nervous Imaginary Friend, and Wilt as a Helpful Imaginary Friend.

When Wilt shows Mac and Bloo the friends at Fosters one of them was the character Mojo Jojo from the Powerpuff Girls.