Peter is the main human character in Once Upon a Time... Life. He is the most recurring character in the series and appears in both younger and older designs. His human body counterpart is Captain Peter.

Peter is usually seen in clothes mainly in various shades of blue. He has regular, short brown hair. In younger designs, he is usually shown wearing a short-sleeved shirt and shorts, but in older designs he often wears a tracksuit or other types of clothes.