User blog comment:B214/High School DxD New 12 discussion/@comment-1392308-20130923195830/@comment-1392308-20130924043810

Katarea and Raynare...what a waste of beauty, lol. Makes me wonder what the orignal Leviathan looked like (but I think it was male...).

I guess that was the sole reason for inclusing them. In case there isn't a season 3 they probably wanted the fans to see some of the characters in action again.