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Catherine being Lilith is kinda a given, but I'm more curious who's The 6th demon lord's reincarnation 600 years in the future.. is it Percival? Percival was contracted with the ruler of bronze, and once one had made a pact with a great demon, they will forever be contracted until the contractee's soul ceased to exist.
But Giovanni acts more like the 6th demon lord.. but he's contracted with Belial not the ruler of bronze