User blog comment:Zeref Fullbuster/Seraph of the End crossovers/@comment-25669979-20161115022742

How about crossover with Supernatural? Set in modern time, went through the apocalypse with angels vs demons, the leading duo (Dean and Sam Winchester) getting caught up in and destined to play major roles in this event like Yu and Mika are in their world. Though what initially led me to this idea was noticing how Yu and Mika's close relationship being similar to the Winchester brothers':

Can’t live without the other and will constantly risk their lives to keep the other safe as they can’t live without the other

One member of the duo deeply cares about and get along well with children. These same people are also traumatized by the deaths of their loved ones which bring about an extreme guilt complex and a deep self-loathing and have no desire get close to other people after getting hurt.

Caught in a war involving angels and demons with one of them having a destiny in it.

One member from the duo uses demonic powers to become better able to fight with shady mentor figures that helped them when suffering from the loss of their family. This also leads them to struggle with retaining their humanity/goodness.

Have a red oni blue oni dynamic

Lost close friends and family.

What do you thnik? Is this too out there or could this be an interesting character comparisons?