Knuckles

A loner by nature, Knuckles is independent, headstrong, and serious, yet gullible and short-tempered to a fault. He is entirely devoted to his duty, spending most of his time on Angel Island protecting the Master Emerald,[12] and rarely cares about anything that is of no importance. When his friends and others are in need of his help, however, Knuckles can always be relied on, being willing to leave his home very often.[12] Though usually depicted as the guardian of the Master Emerald, he was originally described as the guardian of Angel Island's seven Chaos Emeralds.[13]