Going by the art's tags on Pixiv, I think this a virtual_youtuber who doesn't have a lot of fan art. But I have no idea if they're affiliated with hololive, nijisanji, or if they're indie; nor do I know who they are.

Placeholder1996 said:

Going by the art's tags on Pixiv, I think this a virtual_youtuber who doesn't have a lot of fan art. But I have no idea if they're affiliated with hololive, nijisanji, or if they're indie; nor do I know who they are.

It's the character from this song. https://www.youtube.com/watch?v=vRPCAAUBMms "Eve家" is the tag for fanart for character's from this singer-songwriter's works.