Knuckles the Echidna (ナックルズ・ザ・エキドゥナ, Nakkuruzu za Ekiduna?) is a main character that appears in the Sonic the Hedgehog series. He is an anthropomorphic echidna and the current guardian of the Master Emerald, a powerful ancient relic on Angel Island which is his solemn duty to protect from anyone seeking to abuse it, as well as the sole surviving descendant of the echidna race from the Knuckles Clan.