Season 1
Fosters Home for Imaginary Friends was founded by Madame Foster for all disowned and out-grown imaginary friends. A halfway house for them until another kid adopts them.
So when Mac’s mom said that he was too old to have an imaginary friend, he knew just the place to take him.
He made a deal with madam Foster though. For as long as he came to visit Bloo, she promised not to put him up for adoption.
So Bloo moves in with all the other discarded Imaginary friends, and what a lot they are.
There is Co-Co, who is a bird-plant-airplane imaginary friend and the only word she can say is… yup, you guessed it, co-co. So a conversation would sound like this :
Coco: Coco?
Mac: No thanks.
Coco: Coco?
Bloo: Yes!
Coco: Coco?
Bloo: Yes!
Coco: Coco?
Bloo: Yes!
Coco: Coco?
Bloo: Yes!
Coco: Coco?
Bloo: YES.
Coco: Coco?
Bloo: YES! WITH MARSHMALLOWS!
Wilt: Oh, no, Bloo. This is Coco. She wasn't asking you if you WANTED cocoa, it's just that... well, all she ever says is "Coco."
Coco: Coco!
Bloo: Ohhh.. Then what was she asking?
Wilt: Want some juice?
Eduardo is a bulky purple monster with the horns of a bull and the courage of a mouse. He is of Spanish origin and speaks a mixture of English and Spanish.
Wilt is tall and red and has eyestalks (as opposed to normal eyes). He is friendly and always willing to lend a helping. His favorite game is basketball.
Mr. Herriman is a giant imaginary rabbit created by Madame Foster when she was a child. He serves as the president of the home.and is very formal and well-mannered.
And off course there is Bloo –a.k.a. Blooregard Q. Kazoo, who is Mac's imaginary friend. He's a small, wise-cracking, door-shaped, blue blob and tends to get into all sorts of trouble.