In my opinion, I actually like Fat Tony because he develops a good character and his gang references The Godfather

I somehow hate Jimbo, out of the other bullies, he seems to be the worst out of all because just after they did a good thing in one episode, they go back to being bad again, it just shows that they are deceitful monsters who tortures kids out of spite (not including Nelson)

And my most hated villain here is Sideshow Bob. The first few episodes were good trying to hunt Bart, but in the new episodes it doesn't add to the old humor and it just makes me feel sorry for Bart even more. Despite Sideshow Bob trying to be good, the smallest evidence of him as a criminal can trigger him. In the words of Kyle Broflovski, "He's a lying deceitful monster!"