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Finana likes long game playthroughs, and gacha games.
She also likes being lewd. Apparently she used to spend literally all her time browsing hentai sites, and watched every single hentai video on multiple sites. She's given out hentai recommendations on stream. Also, she still lives with her parents. She has a retarded brother who apparently abused her, and she's stuck caring for half the time. She's pretty dumb overall, although she's good at games (for a female vtuber that is).
She has lots of classic moments with the other girls, you'll find her in a lot of fun clips, especially from the old days. One time she got in a lot of trouble, by naming various illegal hentai sites on her stream. She also started naming them in front of Pomu during a membership stream, which got deleted. Pomu is literally freaking out the whole time trying to make her stop, it's really funny.
Unfortunately, when NijiEN grew bigger, the other girls weren't around as often to keep her out of trouble. And being the dumb dumb she is, she started taking advice from fans and discord servers, causing her to mismanage her channel pretty badly. She also had some misgivings about her lewdness, because she didn't want that to be her entire personality.
I think she's best to watch when she's having fun. Being herself. Not trying to be something she's not.