In Episode 9 of the 2 part special of BlazBlue Radio: Hyper ArcFes Recording Special prior of both anime and console version's release, They have the characters' popularity poll in whoever the BlazBlue characters made it on top 10 and the rest is below the lowest. Before revealing top 10, they read the fan letters about the character's fan descriptions.
Here are the top 10 list of characters popularity in the poll they showed in the ArcFes Recording Special are.
Okay what I remember some people below top 10 they are...?
12. Platinum the Trinity
Note: They don't include Amane in this character popularity poll only that it says "Azteca, Mori-P and so on." and never shown other characters below 21. Only that Azrael was in last place.
You can comment this anytime as you wanted too. Because this poll sometimes going comical to the guest voice actors themselves during the ArcFes Recording Special of BlazBlue Radio: Hyper.