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as much as i personally don't like how irys looks, it is very iconic and memorable for a hololiver. it also has a creepy/unreal vibe to it which makes it, again, memorable.
personally i don't think it makes sense for hololive but you should remember hololive does not want to be over saturated and is focusing on cornering most viable markets right now, irys may prove a unique niche for some viewers with her style.