Knuckles

Knuckles the Echidna (Japanese: ナックルズ・ザ・エキドゥナ, Hepburn: Nakkuruzu za Ekiduna) is a fictional character in Sega's Sonic the Hedgehog series. He is a red anthropomorphic short-beaked echidna who is Sonic's best friend and former rival. Determined and serious, but sometimes gullible, he has the ability to glide and climb up walls, and is a powerful fighter with spiked hands. He serves as the guardian of the Master Emerald, a huge gemstone that controls the series' integral Chaos Emeralds, and is the last living member of his tribe, the Knuckles Clan.
Knuckles debuted in Sonic the Hedgehog 3 (1994) after Doctor Eggman tricks him into opposing Sonic and Tails. He first became a playable protagonist in Sonic & Knuckles later that year; after initially opposing Sonic once again, he forms an alliance with him after learning of Doctor Eggman's trickery. Since then, he has appeared in dozens of playable and non-playable roles, as well as in several series of comic books, Western animated television, Japanese anime, and even the Sonic the Hedgehog 2 feature film.