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.
Vegeta
He was pretty evil for a good while, then went back to evil again during ][v][ajin saga for a bit. He did a fair share of evil shit for a good while before he became a bro.