@Cheezymufin cool but your theory has a flaw: it has been stated demons have gone to the human world before, but it seems at some point it was prohibited. So, I think it means he's a really old demon.
@Cheezymufin
That would make Clara and her siblings all "cambions", or human-demon hybrids
The only cambion ever in this manga is Ameri's imaginary daughter from ch 67
My favorite part of this chapter is the fact that this is what Azz and Clara do for the love trio.