User blog comment:B214/DxD Queen tournament/@comment-1359322-20141225110854/@comment-1359322-20141228003016

@anon, but the fact is their characters did matured in both Rias and Akeno's case. Now tell me, did Asia's character changed or matured since Volume 6 till now. No, she has been the same over and over. Asia is a fine character but being depicted as too kind and lack of interesting characteristics.

Look at it this way, Rias and Akeno with everything till now still show that they have their weakness to conquer, plus both of them are clearly maturing. Even the others have issues and weakness that has made them matured or changed, Gasper with Valerie, Yuuto with the Demon Swords, Xenovia with the Ex-Durandal, Koneko and Kuroka's relationship, etc. Asia, on the other hand, literally has none, she's been made in a simple way which is okay. But the simplicity also becomes stale as a result.