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Okay, so I'm 95% certain that Adele is the Demon King but possibly only half-Seuo. The other 5% is that she's just a normal human with insanely strong holy powers? But too many things hint to her being abnormal for that to make any tonal sense.
There are a lot of references to a "true" god, who is probably the one who rewinded Adele due to a 'mistake' made in the previous life. They're also most likely the one who gave Ray his original prophetic dream of Adele being the Prophet despite her very obviously NOT being the Prophet, which leads me to believe that perhaps the true god is trying to put Adele and Ray together on purpose to mend the relationship between the Dehvas and the Seuos (as their respective leaders); while Ray did fall for Adele in the original timeline, he wasn't close enough to her to set aside her being the Demon King once he found out, and ended things with possibly a lovers suicide, with him killing her and then the rest of the Seuos before killing himself (purely theorizing here, but without any Dehvas to lead and Adele dead, he may not see a reason to continue living even in the original timeline).
In this current timeline, however, things are progressing more towards that love alliance, especially as the walls between Dehva and Seuo are broken down (i.e. acknowledging that even Dehvas can be homicidal maniacs, and Lyte and Riley already being another potential cross-cultural love). The only thing remaining is making sure that all parties make the correct decisions moving forward- here I assume that Duve's original owner is most likely the true god trying to intervene without being too brazen about it. Especially with the way Duve eggs Ray on to be almost blindingly trusting to Adele, it seems like Duve is almost training him for when Adele is revealed to be the Demon King.