Jo/Spiral - LoV Ver. - Self Ship with Tomura Shigaraki
Jo's origin story has something to do with online games and college burnout and a lot of free time. She sort of has given up on studying to game and is bitter that there aren't a lot of prospects for someone like her, whatever that means. Jo never considered applying to a hero school, she has some disdain for the system but mostly finds it boring- in another life she might have wanted to study engineering or something similar but why would hero society want innovation when they can just get someone with a quirk to do it? It seems like most tech tracks she could afford are solely for hero support these days anyways, and heroes just aren't her thing.
Somehow she was convinced to visit (or discovered? She picks locks as a hobby but how she'd find it specifically I dunno; might just have been luck, though whether good or bad is hard to say) the LoV bar (how many bars are still open at her very late night owl hours?) And maybe she heard that a pro gamer spent time there, she figured she could learn from him?
She appeared only mildly surprised to find the villains there, the place was sketchy as hell but who cares? It has wifi and the villains can mind their own BS, she just wants to game and while away her persistent insomnia. And she may admit the shenanigans there are a little entertaining... or so she tries to make the others believe. In reality she bluffs and acts casual as a survival instinct. She's scared out of her mind, and very good at hiding it.
She may very well have survived breaking in unaware to the LoV bar solely by challenging Shigaraki to a game of Smash and brutally roasting the playstyle of everyone she's ever played against since the game now solely features famous Pro Heroes and everyone bases their moves off the ones in the media. She figured she was gonna die anyway but acted like she didn't really give a shit at that point... she was halfway resigned to it the minute she realized what she had walked into. Might as well get in one last win and rant since the world is not something she is happy about anyways.
Then, for some reason, Tomura decided that maybe she was worth keeping around (even if him being an All Might main and her being an Endeavor main should make them enemies on principle /gamer drama). She'd make a good hostage, he claims, and he doesn't have time to find opponents he wouldn't rather just kill. She just sort of deals with it, halfway because she doesn't really want to die and halfway because he's a decent opponent himself and she hasn't found many good ones either.
As for general skills, aside from her prehensile braids quirk, Jo can pick locks, "hack" physical technology such as motion sensors, jailbreak game consoles, and can almost beat Tomura at certain video games (he refuses to play certain kinds with her now- It's no fun when she wins too easily). She's good at appearing casual, bored or only mildly concerned even when pissed off or scared as hell; it comes from masking fairly successfully(to some definition of "success"- it actually takes a lot out of her). Her main defense mechanism is false confidence, but that fades after the edge wears off/in a prolonged situation (like the stressful one of being surrounded by villains who she is pretty sure are still going to murder her if she lets her guard down for even a minute- Shigaraki's interest in her notwithstanding).
She's nominally allied with the League of Villains, sort of (she hangs out in their "club" but doesn't seem to contribute much beyond sitting in her corner and playing handheld games). She is still technically a college student and while she has vague plans to drop out, at the moment her face and identity are technically in the college system so it is unwise for her to participate in missions as of now. She claims she'll start working for the LoV "when her hair grows out", but it is very long already so it is unclear what her real intentions are. How long will the others tolerate this before she falls into the category of "dead weight"? Time will tell...
The rest of the LoV do seem to enjoy casually threatening her, though it could be seen as a sort of hazing/trying to get her to react sort of thing. She also doesn't particularly care for inflicting violence herself, though as she gets more involved with the LoV she develops a willingness to fight against heroes more seriously, as they are trained for this and she doesn't expect them to hold back for her. She acts like she has a very similar apathy about everything (other than gaming) that Shigaraki seems to have had toward hero society early on in the series. He is annoyed that she doesn't seem to care about his plans for society, even though to some extent her own feelings are somewhat similar to his outlook as it appeared early on in the anime regarding who gets to use violence and how pretentious heroes can be in the spotlight. But she'd still prefer to just forget the world and game, regardless of how the outside world affects people… it's just not really something she considers her problem, unless it affects her own survival.
For some reason, Tomura wants her to care about the things he cares about, and he doesn't want to get rid of her... yet.
Also, he wants to see if she can beat his latest high score. Among other excuses. And he likes teasing her! She is so much fun to mess with, it takes his mind off other things. She can actually get into good arguments about game stuff, and is knowledgeable enough about certain things it doesn't make him immediately want to dust her, for what that's worth.
Toga claims it's because he has a crush, which he vehemently denies. Both Jo and Tomura react with horror and disgust whenever the idea is mentioned, which Toga insists is a sign they're in true love already.
Over time, Jo becomes slightly more comfortable with the ragtag group that is the early LoV... she won't admit it to herself just yet, but these villains, even when they seem threatening and dangerous, are the closest things to friends she's had in a long time. And when others threaten them, Jo realizes that perhaps she actually cares after all.
She'd never admit it to Tomura, though.
(He still owes her a rematch on the Pro Hero version of Smash, after all.
There's no way she'll give him any kind of leverage until then.)