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Vtuber simulator. You create your own vtuber in one of those autistically detailed character creators and join Hololive. You have to stream and make money. You get to pick what kind of streams you do (gaming, karaoke, zatsudan, whatever) and you have stats that determine how good you are at each of those things, all of which affects your revenue.
You get to meet and interact with the other Hololive members (let's just say they all live in the same neighborhood or even a huge dorm to make this simple). You can form friendships and do collabs, which can give you some stat buffs and/or debuffs. Like, being friends with Aqua will increase your gaming skills, so you make more money on your gaming streams, but will also decrease your social skills. Marine will make you hornier which will make you get more clips and viewers, but increases your chance of getting banned. Korone can increase your endurance so you can do longer streams. Etc.
Another feature could be having to manage your social media. You could go undercover on vt/5ch/whatever to see what rumors and narratives are being spun about you. Depending on how your collabs go, there could be rumors that you hate this senpai or whatever, which could cause them to actually starting disliking you and then you have to do something to win them back. Etc. There are lots of things that could be done with this concept.
This doesn't have to be a Hololive game, it could be Niji or just original with OC vtubers, but that wouldn't be as interesting.
Yeah I copypasted the wrong part before, nevermind it.