Posting about MLP outside of MLP fansites is a mortal sin. The Cafe Society is for manly topics like steak, cigars, and Star Wars vs. Star Trek.
Never played Vampire Masquerades, but I was contemplating and looking at MLP x DCAU Justice League stuff a couple days ago. Everyone else is wrong. Here’s what I came up with.
Superman = Celestia
Godlike being everyone worships, special connection to the sun, but goes down like a sack of potatoes to establish the newest villain isn’t messing around AKA the Worf effect.
Martian Manhunter = Luna
Pseudo-loner/outcast, creepy powers that freak people out, turning into a shadow is sorta like going through walls, and she can go into your dreams, which is like mind reading.
Green Lantern = Twilight
Mostly because their telekinetic powers are so similar. If just focused on the main 6 she’s usually Superman for her leadership role. Personality-wise she doesn’t have a good fit. Bruce Wayne or the Martian, maybe.
The Flash = Pinkie
Stupidly fast, comic relief, and eats everything in sight to fuel metabolism. Usually Rainbow is the Flash because she can go super sonic, but this works better because Pinkie is almost as fast while sticking to the ground and has a closer personality fit. Also in Magic Mystery Cure when they switched destinies the entire town became depressed and angry without Pinkie, sorta like the alternate dimension where the Flash died and the Justice League turned fascist.
Hawkgirl = Rainbow
They fly around and hit things. Always takes the direct approach. Most of their plots involve mixed loyalties.
Wonderwoman = Applejack
Has the rope, the strength, and doesn’t have a particularly extreme personality compared to the rest of the cast. Both have a connection to the Earth itself. AJ might work as Batman though, since the rope could be like a grapple and her parents are deader than disco.
Batman = Rarity
Usually this goes to fanon Pinkamena because of her brooding, but then Pinkie can’t be the Flash. Rarity has a successful business, is a highly eligible bachelorette, no one would suspect her alternate identity, and she can make her own costumes. Plus she could fashion weapons out of her tape measures, gems, scissors, and needles. Only problem is her parents are alive.
Aquaman = Fluttershy
Except she can talk to and command ALL the animals, even dragons and cockatrices.
Zatanna = Trixie
An easy throw in.