IMO Mizora would be better as a mid ranked succubus. They tend to be in all planes in one way or another. She could still grant Wyll the powers of a hexblade. She seems to be a bit possessive of Wyll’s affections unlike a cambion. This could also help explain how a being able to grant warlock knowledge and still get captured. She was busy trying to recruit *ahem* a strong humanoid but ended up being bound by the absolute somehow.