I feel a little dumb for not realising this earlier but I feel like the classes would've have been perfect for a few original Aikatsu! characters. Like:
Flower Song Class: Sumire; Nono; Lisa (they used to sing a lot right?)
Bird Theatre Class: Yurika; Shion (Probably more people but I forgot)
Moon Beauty Class: Ran (WOW such a surprise. Being sarcastic BTW she was MADE for this Class)
Wind Dance Class: Rin (a TOTAL given)
What do you think?