User blog comment:B214/High School DxD New/@comment-50.11.177.49-20130708091553/@comment-33447191-20130708093333

Serafall - Yes, she appears in Light Novel Volume 4, so she'll make her appearance around the second half of Season 2.

As for Ophis, she is mentioned in Volume 4 as well, so if we're lucky, we may see a screenshot of the "Leader" of Khaos Brigade.