Theodore Seville

Theodore Seville is the youngest of the group, he is shy, loving, sensitive, gullible, trusting, naive and cute. In short, he is an easy target for Alvin's manipulations. Theodore also usually holds the swing vote between his brothers, often deciding on their course of action. Alvin goes to bribery while Simon appeals to his better nature.

Theodore gets on great with Eleanor of the The Chipettes. They are both very open about their relationship.

Theodore is the youngest child of the three chipmunks. Alvin being the oldest. As revealed to us on "Grounded Chipmunk".