Tomori's not allowed to, I think Ave Mujica as a concept would fall apart if Soyo joined and Taki would not go where Tomori can't follow, so none of the Crychic kids. (Yes I'm overcomplicating this alfjhslfs) Between Raana and Anon, I'd say Raana thematically works better (that whole deal about wanting a place to breathe, and of course Ave Mujica's themes surround tearing the world down and building a new one in which the characters can live in comfortably) but Anon is probably the better pick in the sense of... well, to put this very simply, which of the two do you think would join a cult easier? Anon all day. In my head I'm just imagining something like what happened with Rika who was just curious about what Ave Mujica was about and then... that happened to her. Anon to me feels a bit impressionable in that same way. Honestly would also put a lot of spice into the mix if she met Tomori first; imagine Tomori makes a friend out of Anon and then Sakiko lures her into Ave Mujica and Anon doesn't come out of it the same way. It would make for some interesting drama.