Fuuka's a shy junior who's chronically ill and doesn't fit the usual SEES mold—she's got no combat abilities and her Personas don't fight either. Instead, she handles tactical support, taking over the role Mitsuru used to fill. During battles, she scans enemy weaknesses, calls out enemy locations before they show up, and keeps the team updated on everyone's health. Basically, she's the eyes and ears of SEES.
Early in the year, Fuuka vanishes for days. When strange things start happening to some girls who used to bully her, Yukari, Junpei, and the Main Character dig into it and discover the bullies locked her in the school gym—where she got sucked into Tartarus. SEES mounts a rescue mission that turns into a real crisis.
Trapped in Tartarus, Fuuka awakens to her actual Persona powers. Right around then, Natsuki—one of her former bullies—shows up at school checking on her. Fuuka saves Natsuki's life without hesitation, and the two end up becoming genuine friends afterward. Even though Natsuki doesn't remember any of it, having her and SEES around transforms Fuuka. She goes from isolated and timid to genuinely confident and caring. Her Persona and her hacking skills both reflect this same thing: an unshakeable need to stay connected to the people she cares about.
The Main Character can date her if he wants. Fair warning though—accepting her cooking invitations requires maxed-out courage, and it's genuinely terrible. But if he plays his cards right, Fuuka falls for him, and he can help her embrace being a computer geek without feeling weird about how un-feminine that is.
Content compiled by AnimeList.moe from publicly available sources.