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Sora is THE Hololive and you cannot have Hololive without her. Even if you ignore her being the first Cover vtuber and Xmas miracle, the entire Hololive project is based on replicating her success being vtuber idol and they hilarious failed at it because they keep hiring otaku as opposed proper idol.
It quite funny to see how other Holo looks up to her despite most of them are much older than her. You can view Hololive hiring process as giving a second chance to middle age otaku to fulfiled their childish idol dream.
As far as Sora as a streamer. Is pretty much what you expect from "traditional" idol who try to communicate with her fan. just a nice cute grounded "seiso" girl.
