My favorite is Bog king from Strange Magic - Has a song talking about how evil he is. But all he does is prevent the spread of dangerous mind control magic, and quarantine people under the effects of said magic. Yes he greatly annoys people doing so, but honestly? If I get hit by a love potion, please quarantine me.
The show is loosely based on a standalone Sandman spinoff comic that I think is quite good.
Funnily enough, I found the comic dry and snooty. The show was a lot more fun.