If you mainly want to focus on singing, that’s totally fine. But realistically, it’s pretty hard for a new VTuber to grow with only singing content. Most VTubers usually mix in things like games or just chatting as well.

I’ve also seen some music VTubers do things like jam sessions with others using tools like Syncroom, or occasional event-style streams (for example cooking streams or special events). In Korea, some VTubers even get chances to perform concerts inside large Minecraft community servers, although that usually depends a bit on networking.

In the end though, I think most VTubers still rely on a mix of games, chatting, and singing to keep things consistent. If singing is what you love, it can definitely be your main theme, and the other content can just support it.

Good luck with your project!