Knuckles the Echidna is a fictional character from the Sonic the Hedgehog video game series created by Sega. He first appeared in the game Sonic the Hedgehog 3 in 1994. Knuckles is known for his red fur, spiked knuckles, and his role as the guardian of the Master Emerald, a powerful gemstone that maintains the balance of the floating Angel Island. As an echidna, Knuckles is unique among the characters in the series. He is often portrayed as serious and determined, contrasting with the more carefree personality of Sonic. Despite his tough exterior, Knuckles is loyal to his friends and often works alongside them to protect their world from various threats.