User blog comment:B214/Volume 21 info & spoilers/@comment-95.90.224.210-20160602194640/@comment-95.90.224.210-20160604055228

Lucifer: ?

Beelzebub: Ajuka (we know this)

Leviathan: Grayfia

Asmodeus: ?

Mammon: ?

Belphegor: Roygun Belfegor (the 3rd ranker of the Rating Game)

Belial: Diehauser Belial (the Raging Game Champion)

I agree with Grayfia and Ajiuka and Diehauser but not with Roygun. The mous must be the strongest of the Devils, and is it not said that he use his King piece and is not so great as the public says ? I think more the new generation will take over. And yeah Vali is not really a Leader type, he is more the fightertype :D