Evil Geniuses

Here's a series of "evil genius" type characters who go back to when I was middle school aged.

Donavon "Rat" of the World: A white, fluffy, genocidal dictator ashamed of his hamster heritage.
Dr. Squash: Result of years of tampering with our produce. Develops his own zombie race from the losts souls of the recently deceased and junk food.
Peppurr Phd: He....does a lot of things...he shouldn't be proud of.