Kind of agree here, that's when NijiEN really hit their stride, 10 females and 10 males was after Noctyx debuted. I was actually watching a few NijiEN's around that time, however just as I was finally getting comfortable with the new faces from Noctyx, NijiEN debuted another wave, and I just gave up keeping up to date and only started watching occasionally. The issue for me was that they collabed so much around that time that I felt I needed to at least have some awareness of every talent (not watch them all, but see a few clips, read a bit of info, at the least), so ILUNA's debut made me peace out.
Yes.
1: Pomu, Elira, Finana
2: Selen, Rosemi, Petra
3: Nina, Millie, Enna, Reimu
4: Vox, Mysta, Luca, Shu, Ike
5: Yugo, Fulgur, Alban, Sonny, Uki
6: Scarle, Maria, Kyo, Aia, Ren, Aster
7: Doppio, Hex, Meloco, Ver, Kotoka, Zaion
8: Bandage, Vantacrow, Yu Q
9: Kunai, Victoria, Claude