It's not surprising really. Goo seems to be making friends with all the nutcases of Foster's, and while Coco is no where near the picture of straight jacket mentality as Cheese and Goo is, Coco is pretty batty all by herself.
The fact she's made up of so many different things, only speaks one word, and can make virutally almost anything come out of her ass, I'd say she's one crazy imaginary friend indeed. Plus Goo seems able to speak "Cheese"ese.
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