Fan Casting Metal Knuckles in Sonic The Hedgehog: The Blue Blur

A robotic counterpart of Knuckles created by Dr. Starline, Metal Knuckles was intended to be his trump card after his initial disastrous defeats at the hands of the echidna. Merciless, relentless, and cold, Starline designed his creation to be an unflinching war machine untethered to the original in an attempt to avoid the fatal flaw with Metal Sonic. However, what he fundamentally misunderstands is Eggman's passion and care for Metal Sonic and thus Starline hardly ever uses Metal Knuckles, often putting him away in stasis after his defeats until the next use and treating him as nothing more than a mere tool. This in turn has lead to Metal Knuckles developing a resentment to his creator.