This is my official Batfam Magical Girl AU Masterpost (everyone clapped)

(image updated: 9/21/24)

I’m going to do a brief overview and then go into more details for those interested.

Bruce being from old money (and apparently being connected to Camelot) inherited a mysterious mineral with unknown properties. In its raw form it’s very unassuming, but when cut like gemstones and added to accessories it can be harnessed into a tool. By altering the mineral into a wearable item it allows the magic within to be channeled. The magic of the mineral connects with its wielder to create an outfit and (typically) a weapon. These outfits do not grant the wearer special abilities outside of the transformation and the weapon, but when worn the wearer is granted (what is basically) hammerspace and a nearly impenetrable outfit. The uniform granted is not something they can alter the appearance of but will change gradually overtime to reflect how the wielder has grown.

This mineral will henceforth be known as Arcanium. It operates on Kryptonite logic in that it’s— allegedly— super rare but also shows up whenever the plot needs it. (I’m aware it shares a name with a card game, but I wanted my Kryptonite spoof)

Martha Wayne unknowingly started the cycle by turning— what she thought was a rare gemstone— into a brooch. She died shortly after having it made and Alfred held onto it in her memory. Like canon Bruce goes on his journey of self-exploration to train. When he comes back he enacts his plan the way he does in Batman: Year One, where he goes out in basically just make-up, and it goes poorly. He wanders his manor trying to formulate a strategy and is drawn to his parent’s room and finds his mother’s brooch. Cue the first magical girl transformation. From there he alters the brooch to fit his bat aesthetic and the Batman Brooch is born.

Dick comes into his life the same way as canon. Bruce takes him in as a ward, Dick tries to track down Zucco on his own, etc. Bruce decides to use the other raw sample of Arcanium to turn into a second magical artifact. He lets Dick pick the theme, and thus the Robin Pendant is born. The rest is history.