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I'm sorry man, nothing will ever top the Niji fanbase. Their main hangout place was literally a dox site dedicated to doxxing and harassing talents. They sent death threats to Reimu, and Nina, and plenty of others. They are so toxic that nobody wants to interact with them or deal with them. Several of the top NijiEN members lost their minds and were forced into 6 month vacations due to the mental stress of dealing with this fanbase.
It is the worst, bar none. Worse than Phase, worse than Holostars, worse than the Rushia's Redeads.