User blog comment:B214/Volume 22 spoilers/@comment-90.219.230.127-20160725155843

Bina Lessthan I thiink could be Bennia. As a grim reaper her power rivals a high-class devils/is the only character who wears a mask/is a huge fan of issei so seeing his worth as a king up close is a golden opportunity for her as well as her for her to join his harem/the name Bina is close to Bennia and Lessthan could be her last name/in her late teens. Bennia of course usually fights wither scythe but we dont know if she  excels in demon magic.