Rabbi Cartman is the biggest example yeah. He does revert to his old ways somewhat, but only when he finds out the other guys are planning to essentially murder his family and everyone else in their timeline. Granted they plan to do that so their alternate universe clones can live in a world less devastated by the pandemic, and he does eventually agree to sacrifice them for a small chance of gaining them again but a large chance of a better world (possibly for his clone to be tormented by echoes of memories, the alternate Stan seems to subconsciously remember that Shelly died in the original timeline).
We didn’t see much of him but the Cartman who ran an actual time travel company in the episode about the fake one seemed a decent dude, but made the mistake of talking to his younger self who hadn’t had the growth yet so he decides to spite himself to make sure he never comes to be
Fact that a fucking Cheney was on the kind of sort of reasonable by comparison if you squint side of the Republican party and basically got chased out for it is wild.