I hope at the end of series there is big war(hopefully between demons and angels) where there is big war where everyone knows he is human but during war Sullivan dies or someone iruma care about he cries and goes into dispair and releases a very strong murderous intent and unlocks his powers and destroys the side that killed his grandpa and using his power revives Sullivan
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Or derkila actually died but because he was so powerful that all his power and knowledge stayed eventually fading but that power used iruma as a vessel and Sullivan follows that power and watches over iruma so this might be why iruma was
Able to use ancient magic and the magic Sullivan used on iruma to understand demon language was actually to unlock derkila knowledge of language (since how powerful Sullivan is his magic can’t last forever and can’t work faraway)
I like your theory but if that happened why does every demon in demon world admire derkila and don’t know that human exist
I think that the parents shown aren’t iruma actual parents but his actual actual parents when derkila went missing he wanted to go for small vacation to human realm there he fell in love with the queen of angels(since there are demons there might also be angels) they fell in love and gave birth to iruma but queen of angels died due to iruma being a miracle existence (being half angel and demon)and transferred all her powers to iruma upon her death not being able to be with person who he loved he fell dispair so he went he to Sullivan and asked his to take care of him after certain age and put a part of his soul into the ring of gluttony and commanded the rank owl to give to some one with my blood so he went back and transferred all his powers to iruma and died but iruma still being a baby and not able to handle all the power given to him became unstable and about to explode and destroy all existence and himself but most powerful demons and angels banded together first time in history and sealed iruma’s angel and demon side and made him human for certain time but both side side wanted to train him to use his power and use him as a weapon so Sullivan proclaimed iruma to be dead but he secretly kept watch due to his promise to derkila he sent him to adoption and secretly kept watch but seeing him treated horribly by them he got summoned and killed the parents and took him.