When are we gonna kill the real actual Odin??

[Corfish]

Odin's appearance reflects the person who discovers the FATE/Delivered killing blow (sorry I forget which.) So Odin can look all different.

I believe it's the killing blow. And considering the number of female miqo'te and lalas, I would assume Odin is more than likely going to be struck down by a female character more often than anything else.