I can see Baal saying no to the position as king but wanting to take sullivans spot but we also know that the demon king can shape the world to his whims and he wants the old demon world back. What we don't yet know is if the role is powerfull enough to affect the minds of the demons. If yes, Iruma could be all on his own soon. Maybe only the other half human won't be controlled if that is the case.
The way princess shura was introduced it makes me think she is a higher being than demons like an angel or a god but she could also be delkiras sister or daugther. Although I think the role as demonlord is as I said before is not a role awarded to a clan or a family if it was by delkiras decree though they might have complied. I mean child emperor stuff isn't new but normally they at least have an advisor that keeps them in check.
Since Baals plan is so dependant on Sullivan adopting a human I have to think that maybe delkiras disappearance might be by his design as well. Whatever happened to him maybe only a human can help and Sullivan was ready to do anything for his liege.
...you need to read from the start, again.
Tons of your "if" and "maybe" were addressed directly.
For instance, Princess Shura is a deity.
Derkila left. He wasn't spirited away or anything. He went to the human world, based on all evidence.
If this is your first language, you need to study it.
If it's not, keep up the good work, because I understood most of it.
Does anyone under 30 have any critical thinking skills or cognitive reasoning?