Cocaine Is A Helluva Drug

In the spirit of me getting 3D Model Rendering softwares, I thought about famous video games and their protagonists....

(Sonic the Hedgehog vs. A Hedgehog)

I see slight similarity...but I don't understand why Sonic runs so fast...
(Knuckles the Echidna vs. An Echidna)

This puzzles me 'til this day. Not only did I not know what an echidna was prior to looking up what Knuckles was supposed to be, I don't really see the resemblance.

That's about all I can think about...

--midas' opponent--