User blog comment:B214/Question and Answers 4/@comment-3003440-20150224224929/@comment-24502975-20150225003815

Asia being kidnapped is more a side-plot to the bigger event going on, which is the attack of Khaos Brigade. Diodora was just being used to achieve this and get what he wants at the same time.

On her personality, in more recent volumes (17) she's started taking initiative versus doing something after the others do. Her primary focus nowadays is healing and Fafnir though.