I guess I should expand on what I meant about the villain "outshining" the hero...
The best example I can think of right from the top of my head is Heath Ledger's Joker in The Dark Knight. Ledger's performance as The Joker ended up being so good and entertaining that he's the character people remember the most and think of fondly from the film. He's the character that ended up being the most "likeable" for how interesting he was as a character. Basically, it's the
Evil is Cool trope done in a way where people cherished the bad guy more than they did the good guy.
The question I posed is how you would avert this trope by writing the villain in such a way where they are interesting characters still but at the same time the actions they take are just so detestable and "hateable" (is that even a word? lol) that you want to see the baddie get his just dessert in the worst way possible (i.e. these characters are complete monsters). TV Tropes dubbed this kind of villain on their site as "
Hate Sink".
I know it's a particularly tall order to write a character like this because they inevitably come off to the viewer as being "cool" or "being a badass". I'm saying this because I have a villain in mind for a certain story I have where my villain still has a sympathetic backstory but the actions he undertakes are done in a way where it completely overshadows those traits and serves to torment the main hero of the story in the most gross, diabolical ways possible.
Redemption arcs are great as well. Bad guys gone good is a favorite trope of mine in a lot of fictional works though I don't think every villain is prime material for that. Others should stay pure evil and sadistic.
What I had in mind are villains who aren't played for laughs and are just complete monsters. The ones that you the viewer end up wanting to see get punished in the worst way possible.
Although that's not to say comedic villains don't have their place of course. There's room in a story for all the types of villains.
In terms of motivations and whatnot I could def see that being the case. Especially if said character's motivations was sympathetic like trying to help those they care about at the expense of others. Even if it means working for the big bad.