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For some reason they don't like girls with black hair, and they don't like it when the vtuber just happens to be a normal human. Most of the girls they introduce are either an animal girl, a mystical being, or a fucking god, and all of them don't have normal black hair. I think it's something they do purposely because they think those kinds of designs would be boring for viewers.
Technically, I think Iroha is the last human character they designed in HoloJP. And she's blonde because every gen outside of Gamers needs to have a blonde girl. For some reason they really, really don't like the idea of creating a design with black hair.
