Ever since that one JLA ish where J'onn recognizes Dream as a martian god, I've been trying to wrap my head around Diana interacting with the Endless and what on earth that would look like. I can't even get close.
Constantine would be a huge kick, though. She would call him "John," and he would stand up straight and be polite and sincere and respectful to her, and Zee would look at Diana like she were completely insane when she referred to him later as a "nice man, but he should be more careful." All "You did say John Constantine, yes? Trenchcoat, foul cigarette habit, perpetual lingering stench of slipshod magic? That John Constantine? Nice?" And Diana's like "yes, a perfect gentleman. You really should have brought him around the Satellite more often when you were dating."