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Maybe It's already been done or thought of but something where the Vtuber avatars are partially taken over, first in online streaming but then, utterly bizarre and sometimes amicable, friendly and even sexual but also horrifying and deadly interactions with physical versions of the Vtuber avatars are reported: As whatever it is behind the takeover partially follows character lore. Maybe have it told from the perspective of someone who isn't a major fan of Vtubers who ends up getting approached by or meeting the Room-mates who are trying to figure out what's going on and how to wrangle their Avatars into either being contained or forming a compromise. For a deeper plot, don't just make it a regular rogue Ai responsible. Have it be extraterrestrial or representative of super-conscious aspects of Human aspects.