User blog comment:B214/Question and Answers 4/@comment-3003440-20150224224929/@comment-24098614-20150224231948

Asia starts as a weak character but as the series progresses she becomes useful, and that trait of hers that attracts Dragon becomes very useful because she was later given a Blessing by Ophis that already enhances this trait that actually made some Evil Dragons become her Familiars, and she contracted Fafnir as a Familar who is a Dragon King.

You shouldn't expect Asia to be a fighter because she is a great support character but it is harder now to get to her because she has all those Dragons as her Familiars, and they serve as her bodyguards but Fafnir is another question because this Dragon is seriously more perverted than Issei.