Don't know as I don't watch V-tubers. I'm just some copper scrolling through Danbooru and Co :D

What? The only relation to Gura is they were both briefly in Hololive at the same time.

There's a lot of vtubers. Dunno what specific premiers and graduations have to do with fan art of them.

If you mean with "feed" /all then it was just the timing of your visit, otherwise you would have to be subbed to this comm and in that case I would question your question.