I just realized but each band has 2 members who basically everyone's favourites, 1-2 that is half who is kinda popular but not as much as the favourites, and the one(s) left is/are the least popular. ((Also this is based on the fanbase overall from what I've seen meaning its all sites and not just this one!))

Everyone's Favourites: Yukina // Sayo // Chisato // Hina // Ran // Moca // Kaoru // Misaki // Tae // Arisa

Half: Rinko // Lisa // Aya // Eve // Kanon // Kokoro // Himari // Saaya // Rimi

Least: Ako // Maya // Tomoe (she is kinda in between half and least but is more towards least to me) // Tsugumi // Kasumi // Hagumi

I know there are people who faves are in half and least but the 'favs' are the ones who I've seen are most liked in the bandori fanbase but I might be stupid who knows.