To be honest, I think it's incredibly unlikely that there'd be any significant or lasting character development even if this series ran for 100 chapters.
This is like the most pointless series ever, but it's so much fun, it helps a lot that the artist is actualy competent enough to get the points across visualy. Wakane's inclusion hasn't brought much to the dynamic, but atleast I like having her around for appearances. As for chapter9's dicussion, I think Aoi made the best case and her transformation was awesome, but in practise it seems I fall into Ouka's side here, all though it might have something to do with exposure.