Can a human become the Demon Lord of the Demon Realm?
Theoretically speaking, perhaps it's possible.
After all, power is the reason for being king. It has been confirmed before that the emergence of Demon Lords has almost no inheritance or pattern, purely random. Among the entire Demon Realm population, if the Mother Goddess is happy one day, she might just choose this one and only human in the Demon Realm, right?
But no matter how absurd Ignis found it, she could only believe Lister's words for now... After all, she had no other choice, right?
"...Alright."
Anyway, I'll assume it's true for now.
"My case is a bit special and related to many mysteries about me, so even I can't give myself a reasonable explanation, naturally I don't know how to tell you either. I apologize for this."
"It's alright, Mr. Lister... I believe you have your reasons, and I will understand."