Tori is an underrated character. I think she gets overlooked because players dislike her for being a mean slutty bitch, but she's a well written mean slutty bitch, and that makes her one of the better characters in the game. She's quite different from the main girls, fills her current role in the story very well, and has the potential to create several differnt paths in the future.
Tori is an unabashed maneater and everyone knows it. I love how Zach (the biggest horndog in the game) is disgusted by your choice of Tori if you choose her for your answer of which girl is the hottest.
Zach: "Tori? What the hell... She isn't bad looking, I give you that. But just her reputation alone."
MC: "I know, but somehow, I don't know what exactly it is. She turns me on."
Zach: "There is something majorly wrong with you dude."
MC: "Ha ha."
and a bit later...
MC: "I think she's put a spell on me or something. I can't get her out of my head."
Zach: "There's clearly something wrong up there."
This is one of my favourite conversations in the game. It was perfect because it exactly mirrored my feeling towards Tori. There was none of the "deep down she's a nice person" foolishness. Instead, it was the classic scenario where you know something is a bad idea, but do it anyways because it's just too tempting.
There was a moment where Tori was enjoying the way the main character was kissing her neck, and she suddenly got a shocked/frightened look on her face before making him stop and saying "No-no-no... We're not doing that. You're here to eat my pussy and fuck me. That's it." That could be a set up for some sort of a melt the heart of the ice queen path with Tori in the future, but it's unlikely many players would be interested in a Tori relationship unless there was some sort of a redemption arc for her first.
A redemption arc would be a hard sell, but it could happen if she did something like help get rid of Lucas or help take down Ethan. Tori doesn't seem to be overly cruel to anyone, at least not to a cartoonishly ridiculous level that would make a redemption arc impossibly stupid. Tori is a fairly realistic mean girl antagonist, rather than an absurd characiture that you can find in another game. She hasn't blackmailed anyone into getting naked so she could push them out into the streets, tasered anyone in the throat until they passed out, or attempted to rape anyone while they were tied to a chair. She did spread some sort of hurtful rumour about Layla in the past, and she will pretend not to know you the day after you hook up. That's about it so far.
Another possible route we could see in the future would be one where Tori starts to fall for the MC, and then he dumps her after Layla tells him a sob story about how mean Tori was to her in the past. Hooking up with Tori and her hot cheerleader friend Jasmine just to rub it in Darryl's face is another thing that could happen, and probably the most likely path as it's already set up well. And even if she just stayed the slutty bitch she is now, and didn't have any big character arcs, I would still enjoy having her in the game.