FACT: Most vtubers probably smell terrible regardless of lifestyle, and this is provable through logic and reasoning.

Statistically, women use antiperspirant at a far lesser rate than men. So if they are using a vtuber avatar, there is even less incentive to have good hygiene or be presentable. Deodorant also wears off after only about eight hours, and because lots and lots of vtubers will stream for sometimes the entire day, it stands to reason that they have lots of bad body odor.

Let's also not forget that vtubers are often sweaty girl gamers, so even if they weren't next to a hot GPU or having to wear a special suit for 3D tracking the constant yapping and stress of being a woman in front of an audience means her clothes will still be soaked and smelly after a longer streaming session.

Last but not least, girls are gross and watch Dr. Pimple Popper and talk about their periods so even if a vtuber somehow avoided having smelly pits and sweaty panties she is one unmuted idol break away from having everyone hear her burps and farts and so on and so forth.

TL;DR no matter how much you may cope about it your oshi is a dirty stinky smelly femcel who reeks and doesn't take as many showers as she should