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JP streamers / vtubers are really careful when *mentioning* someone they've never collabed with. Even more so when it's someone from hololive. 名前言っていいのか分からないけど is a phrase I always hear whenever someone is about to name drop a holo.
So don't worry about some male randomly dropping into a holo collabing with some other female FPS tuber. That's the last thing that would ever happen.