I really agree with merch! As a long time wota, I owe my being broke to idol merch. and on that note, and I just started the game so if this is already a thing, I'm sorry, but member colors!! or the option of having member colors! with bonuses where girls desire a certain color as a wish, or get a small bonus from having their favorite colors... colors giving small stat buffs (pink being cute, yellow energetic, blue being cool etc)
and if there is a generation system implemented, new members looking up to their senpai or wanting to inherit their color!
loving the game so far!!