User blog comment:B214/Volume 23 discussion blog/@comment-1359322-20170203150957/@comment-31137559-20170205204936

I still think Bina is Tiamat. Issei has met all the dragon kings except for her so you got to save the best for last. And plus she's the only female dragon in the series so far. And her good rating could be a result of her being the secret judge of the Rating Games. And that mask could have been created by Ajuka to disguise her dragon aura as a devil aura. And who better than the strongest Dragon King to be his queen. It would be a waste if his queen was already a devil because if she is trying to see if Issei is worthy of her, it would be a waste if the person is already a devil because the queen piece is the most powerful piece. That's just my speculation and what I want to see.