The Best Friends You Can Think Of. So what's a kid to do when they outgrow their imaginary friend? They find them a home at Foster's Home For Imaginary Friends. Madame Foster's is the perfect place to abandon wayward imaginary friends of all shapes and sizes. Like Blooregard Q. Kazoo, the obnoxious wise-cracking uh... blue blob. Eduardo, the big, giant monster who's afraid of his own shadow. Wilt, the tallest imaginary friend you could ever imagine. And Coco. We're not really sure what Coco's deal is, but she is apparently a bird of some sort. They've all taken up residence at Madame Foster's. and the place will never be the same again.