At first I wanted to comment "Sasuke was that you?!" but damn the horrible end left me speechless...
girl your obliviousness is hurting me I cant handle it anymore just tell him ok I have a theory the elf killed rari so that he can summon something (maybe a demon king or something) but rari soul escaped from him and now he needs her soul this time around. so to as a way "disguise himself" he took the form of the pink haired dude or he took the soul out of the pink haired dude and entered his body. The reason why I say this is because he himself said a shell is just a shell. so he views 'ethans' body as just a shell for him to be able to do all the things that he wants to do
Honestly I can't wait for them to meet again. I'm curious about their reactions
My guess (but it's obvious....) : for the Saintess this is a world in a book/novel........