I just listened to the full versions of their solo debuts and idk lol?
Songs:
DiamondCHASE!Dokipipo☆Emotion
Anata no Risou no HeroineMeccha Going!!
StarlightYume e no Ippo
Nemureru Mori ni Ikitai naEvergreen
Idols:
Kasumin | Rinako | Kanata
Shizuko | Emma | Ayumu
Ai | Setsuna | Karin
Well, Setsuna is an otaku, so I figure she is highly likely to improve in my ranking the more time passes, compared to the others.