User blog comment:Sunako30/ Who do you think is the main antagonist of Owari no seraph/@comment-25942629-20160111005130/@comment-25942629-20160111015655

Ferid is probably the nastiest and meanest, perhaps with the exception of Tenri Hiragi, whom we don't see much of. Kureto is doing things to give power to the JIDA and to help them defeat the vampries. He really seems to believe that he is doing this for justice, but delusions are probably required for someone growing up in the Hiragi family. Ferid just does it for... fun? What is he even up to, anyway?

Mahiru is kinda interesting to consider... Although she is portrayed rather villainously, it's only thanks to her efforts that as many humans survive as they do and that the cursed gear ever came about. She does it in a roundabout fashion, but she really appears to save the world by manipulating and betraying everyone.