Asmodean from The wheel of time
He is forced to turn good and then proceeds to do almost nothing till he dies.
Zaphod Beeblebrox and Scarlett O’Hara were the first two to pop into my head.
Then I thought of Death in Piers Anthony’s Incarnations of Immortality series. Sci-Fi and Fantasy are filled with anit-heroes. I can’t believe there aren’t more mentioned.
Arsene Lupin (Both I and III).
While in some takes, they become heroes (Robin Hood types), the fact remains that they’re both thieves (though charming and friendly ones).