User blog comment:B214/Volume 23 discussion blog/@comment-31137559-20170214233224

I just considered this. What if Bina Lessthan is Diehauser Belial's daughter? That"s assuming he has any children. He most likely has a wife considering he's the head of his house. But I would say she's the daughter of one of his mistresses. I doubt the Champiin doesn't have a harem. Excelling in the Rating Games can get you fame, status, WOMEN, money, influence, etc. And we are talking about the #1 ranker who has never lost a game since he started competing. So the daughter of the Champion is a possibility.

Personally I want his queen to be Tiamat or one of the remaining Longinus possessors. I'm pretty sure Bina is seeing if Issei is worthy of having her in his peerage. And if he does make Bina his queen and she is a devil, the reincarnation aspect would be thrown out of the window. A dragon king or a Longinus possessor are the only two I see of being worthy of a quuen piece.