Really, there's two flavors of CE. On "alignment is a personality chart" there's the clinical psychopath who lacks empathy for others or respect for the law. Which like I described, they can assemble a moral code from first principles on a purely self-interested utilitarian framework. And then there's "alignment is a cosmic force" where CE is the nega-inverse of LG that breaks things and hurts people out of moral duty.The Joker
This is pretty dang good. Well. Thing.Chaotic Evil. Do whatever you want regardless of rules as long as it benefits you personally.
If memory serves, that Joker was actually chaotic good. Or CN...Heath Ledger's Joker from The Dark Knight.

The big thing to remember, IMO, is that you don't need to be EVIL all the time to be evil. Someone who is law abiding, kind, and generous most of the time, but, once a year, he kidnaps people and performs unspeakable rites in service to his demonic patron is still evil. Even if he uses the powers granted by that demonic patron to protect the town and serve the people, he's still chaotic evil.
In the evil groups we've played in, that's generally how it works. The PC's know that they are better off together as a gang. Yes, they are murderous scumbags, but, only to other people. In my experience, evil groups suddenly get REALLY polite to each other. In a good group, players will insult and whatnot each other because they know they are safe. In an evil group, no one wants to get on anyone's bad side, so, they all cooperate much better.
The scary thing for me is that smart evil groups tend to be much, much more effective than good groups.![]()

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.