User blog comment:B214/Volume 22 spoilers/@comment-28087053-20170201003247/@comment-28087053-20170201195101

Indeed!!!! We need more serious characters in issei's team and Bina provides that right now, unless it turns out that she's a goofy character later on. But hey!! she is powerful and knows how to keep a good rating and that says a lot about a queen. Issei needs more peerege's like that to help him out and keep him in line just in case he makes some mistakes that would affect him in his career.