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Now i'm really curious of ali-san's identity,,, will iruma go back to the human world?? And how did his parents even summon sullivan if he's that powerful (assuming that iruma travelled to the demon world as payment for his parents..?)
To be honest, I've been questioning this bit for a long while now. Years really. I've come to the conclusion that his parents sold him to Sullivan without properly knowing or caring what he really is.
It's been stated that Sullivan went to the human world without following protocol (that's why Ameri's father detained him at first). If it was a summoning, I doubt his parents would be able to summon one of the "3 greats" as it probably takes more effort and offerings. It's also possible that they did try to summon any random demon and since Sullivan was already there in the human world searching for a grandkid, he was the closest demon and summoned him instead.
These are all just theories of mine for now. There are also other factors mentioned that could affect it such as the fact that Iruma reminds top demons of the Delkira the Demon King. Everything is too much of a coincidence.
Chest-san's human form actually looks kinda hot:p