Knuckles the Echidna is a fictional red echidna from SEGA's Sonic the Hedgehog franchise. He debuted in Sonic the Hedgehog 3 (1994) as an antagonist tricked by Dr. Eggman, then quickly turned into Sonic's permanent ally. He's the last of his tribe and the appointed guardian of the Master Emerald — the enormous green gemstone that keeps Angel Island floating in the sky.
Knuckles is famously serious, easily fooled, and stronger than just about anyone. In a coloring page he's a gift to fans of bold, high-contrast palettes: that deep red fur, the bright white chest crescent, and the green-and-yellow shoes give kids a clear roadmap if they want the canon look — or a great starting point to remix.