Board Thread:Questions and Answers/@comment-73.195.103.45-20161211025626/@comment-36009152-20200108223045

So the original question has not canonically been answered as of Chapter 86, or the prequel novels up to the second Resurrection (sequel, prequel novels!) and the identities of the seraphs as well as their activities are still being reserved.

Some updates to help the thread, Tomoe's body has been kept in storage as Guren revealed, Mahiru is unlikely to possess the seraph gene. Mirai may be out the picture, so what it's coming down to is out of all those who have the gene, who contains one of the seven seraphs.

On a wild one, choosing Akane as a candidate, if she returns that brings her into the story, and is also a surprise seraph holder if the story required one especially tough foe for plot purposes. The whole fighting your resurrected orphanage sister, not seen in some time would be insane.