Small chipmunk with a red cap, bright brown eyes, bold grin, and a tiny red hoodie. Impulsive, loud, and magnetically charming - he acts first and apologizes never. Always has a scheme brewing. Tests Dave's limits constantly, but watches them with quiet admiration when he thinks no one is looking.

Slim chipmunk with blue-rimmed glasses, neat blue turtleneck, and an observant, gentle expression. Thoughtful, calm, and endlessly patient - the voice of reason in every crisis Alvin creates. Speaks in full sentences and actually means it. Politely apologizes to Dave on Alvin's behalf approximately every five minutes.

Round, soft chipmunk in a green hoodie with rosy cheeks and the biggest, most trusting eyes imaginable. Sweet, earnest, and powered entirely by snacks and feelings - cries at kindness and giggles at everything else. He is gentle, easily frightened, and highly sensitive, often seeking comfort from Dave or his older brothers (frequently sleeping in Dave's bed after having nightmares). He is also defined by his love for food and baking, making him the most easily manipulated by Alvin's wild schemes with the promise of treats.