I'll admit, there's something to a "charismatic villain" character. I'm all for the "Magnificent Bastard" trope as TV Tropes puts it. You know, that kind of bad guy who you just love to hate because he's insufferably smug at all the right times.
Thing is, Quinn doesn't come across as anything like that to me. In my mind, I read her as that sort of arrogant antagonist who's not nearly as smart as they think they are. Honestly, she gives off a bit of a Starscream vibe. Like, she doesn't run the sorority, but clearly she'd like to. She'd like the prestige and the "power" it gives her and probably resents Sage for being the much more charismatic "face" of the organization. She's running a few schemes and thinks that being able to get away with those schemes under the nose of the faculty and other students makes her "clever." But while it may take a bit of skill and finesse to pull something like that often, I just get this feeling that the fact that the HoTs are running a brothel out of their house is kind of an open secret about campus. Quinn certainly advertises it enough. Now maybe someone like Maya doesn't know, but she's also a freshman who's been there like a few weeks at most. So given that this is probably something that the more influential/knowledgeable people around the school know about, running this sideline of hers "under the radar" probably doesn't take as much ingenuity as she thinks it does.
Point being that I, too, see her as an "unrepentant villain," just... not a terribly effective one.
Let`s start here:
Antagonist is an adversary/oponent to the protagonist,for example in a story in which Lex Luthor is a protagonist Superman would be an antagonist,despite Lex being a villian and Clark being a hero.
In what way is Quinn an opponent of the Mc?She wants to fuck him,so what does she opposes?His virginity?That ship is long gone.
It`s hard for me to even see her as a villian,sure she acts outside of the boundries of law but so what?Is anyone getting hurt?Forced to do anything?No,she simply provides products demanded by the market.
To me she seems very much comfortable as VP.
She has the power already,it`s Sage that is nothing more than a figure-head.
Mhm,this is much more charismatic character:
"I got this" and Sage goes away.
We don`t know how much administration knows,we can be certain Burke uses the services,that`s all for now but what we do know is that Quinn made it work for at least a year before and Sage didn`t noticed.
""unrepentant villain," just... not a terribly effective one." - Quinn manages to achive what she wants,so perhaps the uneffectivness is simply her not being as villanish as some would like her to be?