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Beatani has a lot of 'lore', makes up situations, characters, memes, she literally has more info in her wiki page than most other vtubers including corpos that have been streaming for years. She also interacts a lot with her viewers, so it's easier and more fun for a fanartist to reference these bits of lore in their drawings instead of just drawing her in a generic lewd pose or something, and they can be sure Bea will acknowledge their art.
This is why western EN indie vtubers are inferior. Even with their hordes of bots stat padding their twitch views, they'll never get the amount of interaction and engagement of someone like Bea. She provides an experience and all the other thots are just that, thots streaming with an avatar.