User blog comment:B214/Question and Answers 6/@comment-9595671-20160714212150/@comment-9595671-20160715000723

Hmm... maybe it's like with what Crimson said about the Buddha, but with Gods giving some special powers to Humans. Odin with Valkyries, and Hades with Grim Reapers.

And as Bennia who's half reaper shows, this results in them no longer being human, or atleast sometimes it does. Valkyries are probably an exception due to being all female.