|This character exists primarily or exclusively within the Pre-Super Genesis Wave continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
- The "Off Panel" strip from Sonic the Hedgehog #243 features a character named Brass Knuckles.
- Given their name, it is likely that the Brass Knuckles are intended to be descendants of Knuckles the Echidna.
- The Freedom Fighters of the Galaxy and their enemies, including the Brass Knuckles, currently hold the fifteenth-longest non-appearance gap in the main series, though it is unknown if they will return at all (StH: #104-#207)
- Their name derives from the weapon known as Brass Knuckles, which have been made illegal in a wide range of the U.S.