Knuckles Name - Knuckles
Species - Echidna
Skills - Spin attack, rolling attack, gliding, climbing, punch attack, digging
Strengths - Martial Arts, Treasure Hunting, Dedication
Weaknesses - Gullibility
Duty - Guardian of the Master Emerald

Knuckles the Echidna made his first appearance in Sonic the Hedgehog 3 as an unplayable villain. The first we see of Knuckles is in the opening intro when he smacks Sonic and sends the seven Chaos Emeralds flying. He had been tricked by Doctor Robotnik, though, and thought Sonic was a bad guy, trying to steal the Chaos Emeralds.

And why were they so important to him? Knuckles is a guardian of the Master and Chaos Emeralds. He lives alone on the Floating Island where he guards the Master Emerald. He lives peacefully unless he feels the Emeralds are in danger, which is actually quite often. He's a bit gullible, but he's dedicated and has accepted his fate whole-heartedly.

Knuckles has appeared in the following games:

Sonic the Hedgehog 3
Sonic & Knuckles
Knuckles Chaotix
Sonic Blast
Sonic the Fighters
Sonic R
Sonic Adventure
Sonic Shuffle
Sonic Adventure 2
Sonic Heroes
Shadow the Hedgehog
Sonic and the Secret Rings
Sonic Chronicles
Sonic and the Black Knight
Sonic & Sega All-Stars Racing
Sonic Generations