User blog comment:CureLightning/Part 5 announced??/@comment-30886579-20161230150650

i believe that the general rule is the current admins and Haruka cannot be S4, only the main characters can be.

i) w/ Type Theory - Yume-Rola-Mahiru-Ako will be S4. I assume that no new characters added in this season, since only less than 10 episode for part 5 and it is called the decisive battle so it ends with 5 parts.  And then Ako, Mahiru are fixed so Yuzu can't be with them. But than Hikaru must change the S4 rule or Rola change class [less likely]. But the convenience is that bandai already make their unit aura. All rookie seems weird as well.

i) Lily-Ako-Mahiru-Yuzu will be S4,  if bandai wants Yume-Rola competition and feature admin life, and tone down the importance of S4. But it will be quite a pity that bandai tried to raise the tension of S4 but next season make it a sided ones and admin works may not be as interesting as it is. But if bandai don't mind doing CG of them, there will not be any problem.

ii) Yume-Ako-Mahiru-Yuzu if Yume can activate Rainbow aura in the battle [i hope yume won't control and not letting that aura comes out since it is an important competition it would be stupid] but then no Yume-Rola competition. Not likely to happen.