Knuckles the Echidna (Sonic Underground)

Knuckles the Echidna is the super-strong guardian of the Floating Island, and protector of the Chaos Emerald that keeps it afloat.

History
Knuckles was heavily dedicated to keeping the Emerald safe, and would defend it with his life against all who trespass on it. He first appeared on the show when he captured Sleet and Dingo, intending to feed them to Chomps, his pet. However, he was tricked into believing that the Sonic, Manic and Sonia were going to steal the Chaos Emerald. Initially, this was their intention, but Sonic changed his mind, and brought terms of peace with Knuckles. Knuckles soon developed a crush on Sonia.

Personality
Knuckles has a tough personality, dedicated to keeping his island afloat. However, he tends to be gullible and easily mislead, thus leading to his attacks on the Sonic Underground.