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Knuckles the Echidna is an anti-hero (with a strong lean towards hero) in all Sonic continuities.
Knuckles is the supposed last of his species, the ant-eating echidna. He was born on Angel Island and became guardian of it and the most powerful object in the universe, the Master Emerald, as his family has before him.
Life was peaceful on the island until Buzzsaw invaded the island. Knuckles went off after the robot to keep him from stealing the Master Emerald and cause the island to fall. However, he was captured in the process and imprisoned on the Death Egg until Sonic the Hedgehog rescued him. They worked together to retrieve the Master Emerald from Dr. Eggman.
Knuckles is usually calm. However, he is easily angered, and is not afraid to go into an absolute rampage if you anger him enough.