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Flare's Japanese fanbase is perfectly fine she just targets a specific niche being the only Sankisei whose fans are primarily women and yurifags. This results in having a relatively low sub count compared to her genmates but her average live viewers is pretty good and her superchats are very high, pretty much on par or better than the rest of her gen except Rushia. Most of that money is cute OLs that desperately wish they were as lucky as Noel to have Flare in their life.
Her personality is too complex for EOPs to grasp without knowing Japanese though so she hasn't seen the same insane growth as the other members of her gen got in 2020. Pekora's personality can be summed up as just being a streamer who yells a lot, Marine is horny boomer, Noel is menhera boingboing, Rushia is yandere pettan, but Flare can't be as easily summed up beyond the fact she's a lesbian. Her clips also aren't nearly as juvenile-pandering as Miko saying the n-word or Pekora saying rrat so nobody will deliberately seek them out to learn more about her unless they just like her model, which admittedly is what attracted me to her as well since her design stands out a lot.
Nitpicking Flare's sub count is such petty numberfagging though, by all other metrics she's outperforming every other gen and her income is probably solid. So long as she's doing well it's better to fly under the radar with a large loyal niche than being relegated to a meme like Pekora.