I don’t like Vader being a cool badass that kills everyone and is deeply convinced that he’s doing good for the Galaxy.
Canon Vader isn’t deeply convinced that he’s doing good for the galaxy. On his first mission to steal a kyber crystal from a Jedi, he literally outright admits that he’s monster before bursting a dam with the Force, drowning an entire city.
Canon Vader sees himself the way all Sith see themselves. “I’m evil, but that doesn’t matter. I’m more powerful then everyone else, I can do and take whatever I want.”