An anthropomorphic chameleon, who mainly serves as an intelligent ninja warrior and a member of the Chaotix Detective Agency. There, he works together with Vector and Charmy to solve whatever cases they are given, where he puts his skills to good use. While initially a hothead when introduced, Espio has since become a calm, soft-spoken, serious, and disciplined person whose wariness and soulful character makes him a vital member of his team, and balances out the foolishness of his friends.