Knuckles

Knuckles the Echidna, who is also known as Knux for short, is a red echidna from the Sonic series. He will compete against Mario and others in Olympic events in Mario & Sonic at the Olympic Games. This enigmatic guardian of Angel Island (previously known as the Floating Island), an island that floats above the seas of Sonic's home planet (which has, depending on media, been referred to as Mobius and Planet Freedom, in addition to being often implied as Earth), was once against Sonic, as he was tricked by Robotnik (also known as "Eggman") into thinking the hedgehog was after the Chaos Emeralds that kept his island aloft. Eventually, Sonic was revealed as the hero he was, and Knuckles has often found himself helping Sonic out (although the two still often fight and show signs of disliking each other). His special abilities include gliding through the air, digging, climbing, and punching with his trademark white boxing gloves, which feature spiked knuckles (hence his name).