Eggman

"I'VE COME TO MAKE AN ANNOUNCEMENT, SHADOW THE HEDGEHOG'S A BITCH ASS MOTHERFUCKER"

Doctor Ivo Robotnik is the opponent of Sonic The Hedgehog, some of his most notable features include being round in the shape of an egg and trying to build an amusement park only to be defeated by a very fast urchin.

History
A furry annihilator, he hates those furries so fucking much he created an interdimensional portal just to send his spiky nemesis there, and it accidentally caused the death of the universe. /ourguy/

Off-Season 2
Doctor Ivo Robotnik was introduced and did jack shit until he became friends with Door-Kun.