utaite soraru

When vtubers became popular, they decided to also become vtubers, they were streamers previously as well. All the people you mentioned are utaite. Basically utau is covering music. I think everyone's already explained utaites pretty well, so I'll just list some of my personal favourite utaites which are mafumafu, nqrse, meychan, rib, ito ... free congratulations cards