I think I’ve figured out my favorite chemistry for the DC Trinity, as follows:
Superman and Wonder Woman are the kind of friends who treat each other like siblings, but they 100% mean it. They laugh, they hug, they get at least one meal together every week, they occasionally finish each other’s sentences, and when they’re in the same room you can tell they genuinely like each other. They know each other like siblings, too - one won’t know every detail about the other, but they can pull out years-old esoteric stories that no one else had any idea even happened, and they each have a keen sense of who the other is deep down. Clark and Diana know each other’s dreams, fears, and morals, and that trust is visible. The only thing that tells you they’re not actually related is that when they disagree, they argue like well-adjusted adults, without any psychological manipulation or maiming. Sparring is a bonding activity for them, not a way to express anger.
Wonder Woman and Batman have a bond that is entirely platonic but mind-bogglingly deep. They should have the kind of relationship where it’s perfectly normal for them to shower together after a mission and discuss what the Justice League’s next steps should be, but if you point out that it’s kind of weird for them to share a showerhead and a shampoo bottle they’ll act like you’re weird for pointing it out. Bruce is washing blood and concrete dust out of Diana’s hair. There are no sexual or romantic vibes whatsoever. They’re at a level where it’s almost like they’re two halves of the same mind, like if they got into some crazy magic mishap where they were sharing a body it would move like a well-oiled machine. Even when they disagree or argue it seems like a single entity having an internal battle. They have crazy trust, like knowing-every-corner-of-the-other’s-brain trust, to the point that the greatest way to show their affection to each other is allowing each other their secrets. Bruce doesn’t pry past Diana’s hard lines and she knows when to stop pushing him, and those boundaries are honored because literally all the others are gone.
Batman and Superman, however, have inexplicable vibes. At a glance they act like coworkers, or like good friends, but if you look longer than thirty seconds there’s something between them that’s tangible enough to cut - it’s also weirdly horny and literally no one else wants to get involved with it. You could walk into a room where Clark was making coffee and Bruce was doing paperwork and they weren’t talking to or looking at each other and you would feel like you were intruding on their marriage bed. They keep up the same level of professionalism with each other that they do with the rest of the Justice League but they might as well not fucking bother, because somehow it still seems like they’re incapable of not broadcasting that they want each other carnally. They also have a deep level of trust, but it’s not familial or platonic. It’s more like the kind you have with someone you’re so deeply in love with that you can’t fathom not sharing your entire self with them. The world could end in burning flames and they’d survive it without going insane as long as they had each other. No one is actually sure if they’ve ever acted on these feelings, or if they’re even aware that they have them.
All three of them would burn the world down for each other, obviously, so it’s a damn good thing they’re saving it instead.