User blog comment:Stbk22/Possible Power up's/Techniques for then new group DxD/@comment-1359322-20140913140759

Well since we're waiting for Volume 19

Issei - has no need for the time being

Rias, Akeno and Koneko - further polish technique

Asia and Tsubaki - Obtain BB

Xenovia - Master Ex-Durandal

Irina - Level up (?)

Yuuto - Find new possibilities. I'm still going with the 15th Longinus where he fuses the Demon Swords and SGs.

Ross - Complete 616 theory

Gasper - Improve his control

Vali - Master Emperio Juggernaut and well his new power-up (My Justice Gundam concept?)

Arthur - Get a second weapon.

Sona and Sairaorg - A finishing move each

Saji - Master BB

Others - No idea.