It's way too early to be calling this "origins" of anything, I haven't seen anyone else use this design. The only thing it shares with a handful of other depictions is the single braid hairstyle, which is still much less common than above the shoulder hairstyles.
post #4247913 is much closer to being "origins", but it's still too early. Not to mention it's based on the clipart Pekora used, and not entirely original.
Alright, since this design is now the most commonly used one. I'm gonna add it into "origins" pool for real now.
Should this go HiH as it is the basis for her Live2D design?
No. It would be HiH if you could somehow believe it's a total coincidence that they used the exact same design, but they got Hikosan to design her model, so they knew what they were doing. It was the most popular fan design, so it's hardly surprising. Hololive is very in touch with its fans.
PekoMama is already one of the most Popular Holomilf HoloMom ever since Pekora brought her on stream and fanartist were already drawing some nice fanart of her. But now after her 'official' debut the amount of fanart of PekoMama practically exploded like overnight. And god bless these fanartist.
Oh god I just realized that this is REALLY cosplayception - Aerith is cosplaying Horizon's skin where she cosplays Aerith.... I thought it was just a younger Horizon before
Imagine introducing universal break gauge damage as 4* just so you can be outperformed with the same trick by 5* characters later on. And being introduced between main story chapters to boot despite appearing in the main story.
Xueyi got done so dirty even though she's such a good design.
The trends in question do not include parodies of memetic moments/quotes or popular expressions/reactions such as nyoro~n, can't be this cute, and the troll face.