Knuckles the Echidna is a red echidna warrior from the Sonic the Hedgehog series. He is the guardian of the Master Emerald and the Angel Island, known for his strength, digging ability, and serious personality. Often acting as both ally and rival to Sonic, Knuckles plays a major role in protecting the Emerald and stopping villains from abusing its power. He is a recurring main character in games, shows, and comics, and is one of Sonic's most recognizable companions.