@Kenz0Ark **Manga spoilers for this manga**
I understand Shinobu, but I really don't understand Nene. Her chances of being Apollo are legit below the 1% imo. Not only does she have practically nothing going for her, but she also has a number of things going against her, like the firework confession and her being bad at Kanji. As for Iko, well, she has nothing going for or against her, but we all know it's Ikover for her (also her whole vtuber streams just tip it off for me, cuz I don't really thing after MHT Apollo would be doing another faceless broadcasts. Just my personal opinion)
It can only be Rikka or Shinobu, with Rikka being the very likely candidate. There's just way too much evidence pointing it's Rikka , but this whole thing with Shinobu being Apollo is confusing, too, but not at all improbable. I would be genuinely shocked if it wasn't Rikka, tho. She just looks way too good for it.
I'd be happy to discuss on what I picked up that made me conclude it's Shinobu (40%) or Rikka (60%) since I read some reddit and no one talked about what I had in mind. But I don't think I'll be doing it here since I half-intended to promote this masterpiece with this post, so I'll just make myself hated instead by spoiling.