User blog comment:B214/High School DxD EX/@comment-27083298-20170415041321/@comment-31137559-20170417031349

Well she's a Great Seraph and an Archangel now since she's the leader of Heaven now. And I believe that any Seraph can be a Great Seraph. It's just that those four were chosen as Great Seraphs because they were the strongest. Metatron, Sandalphon, Raziel, Remiel, Raguel, and Sariel are also Seraphs that could become Great Seraphs. Great Seraph is just the title given to the heads of the angels with the Archangel(fprmerly Michael, now Gabriel) being the one ultimately in charge.