User blog comment:Crimson Marauder/Origin of Vampires???/@comment-25942629-20151218150038/@comment-33177490-20160102170341

I found an outdated theory about Guren becoming a vampire, but mentions noticeable things like Mikaela, Yuichiro, and Guren representing three angels.

Mikaela represents Michael, the archangel.

Guren represents Gabriel, the messenger angel.

Yuichiro represents Lucifer, the fallen angel.

More so, you see a lot of pictures with these three guys together in a lot of manga illustrations.