|Steroid Knuckles the Echidna|
Steroid Knuckles (ステロイドナックルズ) is a name given to Knuckles by Steve Marcotte about how Knuckles appears in Sonic Boom. He is used for humorous moments, usually punching Luigi in the face if he makes a mistake. Steroid Knuckles is a Minor Protagonist/ Antagonist in SuperSpy Luigi.
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