Pale Lights / W.I.T.C.H. Crossover
This might just be one of the nerdiest things I've ever done. I'm also fully aware that there probably is very small fandom overlap between a two decades old European magical girl's comic by Disney and a Lovecraftian Renaissance Mystery online book.
I had fun, though. I made a lot of W.I.T.C.H. fanart some ten-twenty years ago. So referencing the comic art style again was super nostalgic. Combining early 2000s tight polyester with hints of Pale Light's setting fashion was also quite the experience.
I made "Not-Maryam" (Naryam) the Keeper of the Heart because she's basically pieced together of a soul, a bunch of aether and a whole lot of spite. And traditionally the fifth element has been assigned to aether. She might even stick around and help the rest of the group if they grovel appropriately.
Somehow, Angharad manages to both have least revealing - and most practical - clothing item with the breeches. And still show off the most skin.