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Finana's big weakness is she's got the worst zatzudan game of lazulight, which is why her gacha streams are braindead boring. She needs something happening in the game to reach her peak.
Her Hitman streams are a good example of this. When she actually tried to get the kills or fucked up and got detected she was great but the rest of the stream could get pretty dull. She can't entertain well in the dead gaps as good as other streamers so ideally she'd avoid games full of those.
Finana actually is really strong with FOTM games. Her needy streamer girl stream was the best one out of all NijiEN, her undertale was comfy and enjoyable with her laughing at all the dumb jokes (shame about the monetization paranoia making her drop it) and her RE8 stream she went knife only for a good chunk of it before she dropped it, even knifing bosses because she didn't want to run out of ammo.
She would have been in full gamer-rage if she tried elden ring which would have made it hilarious. I could see her getting worked up if she played that meme shit vampire survivor too.
She's just avoiding all the FOTM games that ironically would play to her strengths.
TL;DR Finana would make a great FOTM streamer but actively avoids playing FOTM to play shit she can't make entertaining. And I blame her groomers for doing that.