HaroldRowsdower said: How does Kuriboh eat? It doesn't have a mouth...
It DOES have a mouth. See the first 5-10 minutes of the Pyramid of Light YGO Movie. Kuriboh tries to bite lil' Yugi.
...that made a friend stand up on the middle of the cinema and scream loudly "KURIBOH IS EVIL!! KURIBOH IS EVIIIIIIIL!!!!" and apparently he lost his childhood there or something.