Nishi chose such a perfect villain for Balam to deal with. Completely opposite to his nuturing nature. I also love this section of chapters for expanding the world and giving us some interest into the other demon king canidates. Despite his maybe crude original introduction, he cares deeply for those around him, his selfishness expands to those in his care and wanting them to be safe which is a greed I am particularly fond of when it comes to characters. I also like that Clara's brother isn't some flat goody toe shoes of the family, he has some depth to what he likes and what he is willing to do.
TL;DR
I love Iruma-kun's world buillding and story