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You really need to know at least conversational Japanese to get a decent level of enjoyment from someone like Mito. It's the same for other top Nijis like Toya, Kuzuha, etc. They're popular because they're genuinely entertaining, while holoJP is popular because they make le funny noises, say meme words, scream, etc. Basically hololive is for the plebeian masses and Nijisanji is for the elite.