Knuckles the Echidna is a fictional character in Sega’s Sonic the Hedgehog series. He is a red anthropomorphic echidna who is determined and serious, but sometimes gullible. He has the ability to glide and climb up walls, and is a powerful fighter due to his spiked hands. He serves as the guardian of the Master Emerald, a huge gemstone that controls the series’ integral Chaos Emeralds.