I'd thought I'd add this for fun, and see what people would come up with.
If you want to add an oc of yours, leave a comment.
Characters can't be OP, makes it unfair.
Characters can be any age you want, just their bio has gotta make sense (eg, a two year old can't have existed three or more years ago, cause thanks to sonic 06, time travel is stupid)
Characters can't have been an important part of a character's origin or cannon choices (eg. You can't prevent mighty leaving team chaotics, or stop Maria's death)
Can't be faster than sonic (unassisted)
There's a spectrum, meaning the oc can't be super smart and super strong (eg. Eggman is smart, but not all that powerful alone. Knuckles is considered strong, but doesn't get math)
So here's a structure to help you out, just in case:
Species: (robotic OCs stated here)
Appearance: (including clothing)
(Optional) weapons and other battle gear:
Chaos control: Y/N
Weaknesses: (eg, phobias, weak spots, mental trauma, etc)