User blog comment:B214/Volume 23 discussion blog/@comment-86.143.86.100-20170203180136/@comment-31137559-20170211155928

We can consider Issei's BB as a subspecies. It took form based on his traits as a pawn. For example, Siegfried got dragon arms based on his abilities as a swordsman and having 5 demonic swords. I would like to have Kiba being able to use Sword Birth and Blade Blacksmith both at once. And he should gain a Balance Breaker which combines both like Sani's.