...but I haven't painted your eyeballs yet.

I read old character outlines (from Sega Technical Institute) that compared Knuckles to Dorompa in the Oba-Q story. I get carried away trying to make a 1-1 match when I read something like that, I tried to find a way to illustrate the process. XD
(that rat is Cookie, my Sonic self-insert. It draws pictures and doesn't talk.)

Knuckles (c) Sega
Dorompa and Qtarou (c) Fujio Fujiko (a duo, for the record) or Shogakukan, not sure
Cookie and art (c) me