Chip is Mrs Potts' from Beauty and the Beast and also Kingdom Hearts II.
Beast locked his servants in the dungeons after Xaldin came and tried to turn him into a Heartless. When Sora and the others came, they freed the servants and helped them save Beast from turning into a Heartless. Lumiere and the others showed them a short cut to the Beast's room.
Chip is the only character in Beast's Castle that doesn't have a voice actor.