| Metal Knuckles |
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| Debut: Sonic R Appearances: Sonic R Age: None DOB: None Species: Badnik Eyes: Apparently Neon Green Color: Red Height: ? Weight: ? Weakness: None? Dislikes: None Likes: None Enemies: Knuckles the Echidna, Tails, Sonic the Hedgehog and Amy. Friends: Eggman? (creator) Residence: ? Abilities: Same as Knuckles |
| Like Sonic, Knuckles has a mechanical version of himself. Only this time it can supposedly perform the same tasks as the echidna but better in every way. He only appeared once however. |