Robert Downey Jr is the obvious case of a person who had a redemption arc, to simplify it he was a promising actor that got addicted to drugs, fell off, went to rehab and then became a huge hollywood big stsr known, even known for being Iron Man.
What real life person had a redemption arc?
Elon Musk. Started as a likeable tech billionaire but eventually redeemed himself to the right wing fascists and extreme edge lords.
Similar to this, there’s this guy who’s close to the living embodiment of the Seven Deadly Sins - venal failed casino owner, corrupt real estate developer, unfaithful porn star fucker, boastful self promoter slapping his own name on all sorts of things from buildings to steaks to scammy colleges. He hasn’t directly killed anyone, but arguably is responsible for hundreds of thousands of deaths.
And, yet, to some people, he’s basically become the right hand of the God.