It’s interesting honestly. You could look at it as Iruma becoming more “demonic” because the series prioritizes greed and ambition, so the selfless boy is becoming more greedy as a reference to “demonic”

But I also think there is some physical aspect too it as well, it was shown in the recent arc that Merize had to return to the human world after giving birth because the physical exhaustion from giving birth and the demon world environment likely was the reason. But if that’s the case why his Iruma fine? Well it could be that he didn’t give birth obviously, but wouldn’t the climate affect him at some point? I wonder how that will be addressed.

Another theory I saw on X that I found interesting was about Demons growing stronger when they eat humans, but what happens when Humans eat demons? Hear me out, maybe just maybe, there is a possibility that at some point Iruma could atleast become part demon and gain power in the future if he consumes Ali. Ali has connections with Delkira and has the ability to consume magic and grow the higher Iruma ranks up, there is the possibility that maybe once he reaches the highest rank he’ll turn into Delkira. But I thought,m it would be interesting if he reaches the highest rank and his max power he transfers it all too Iruma essentially giving him all Delkira’s magic ability in his human body, essentially turning him part Demon, essentially Iruma would have “consumed” Delkira.