I feel like the expected actor list from ch 110 is going to end up as the final cast. Frill-san as the main lead makes little sense other than a "popularity reach", and Ruby is still a little lackluster. Of course it is shown that Ruby has talent and it would be good marketing to have the two main leads be the children of Ai, but as of now Ruby is too emotional over Ai. Akane makes the most sense as being the only person to almost fully embody Ai through her insane method acting style, to the point that Aqua was duped for a split second at the start.
They might end up doing a bait and switch tho idk