You know what I've been thinking about?
They're these little teddy bear-like aliens from this series of short stories. And one short novel. They either have trouble distinguishing fact from fantasy, or they're very adaptable, or both. Anyway, the end result is, they read a book or watch a show or a movie or something, and they start to think/pretend they're the characters from it.
Anyway, I've been thinking that they're the perfect thing to crossover with other fandoms.