PMMM Precure AU! It was fun trying to keep their outfits recognizable while trying to make them look more cohesive. Homura's is definitely the most changed, so I hope it still looks enough like her???
The themes would be gemstones, jewelry, and wishes. I'd probably have their Cure names be gemstones, maybe Opal/Morganite, Sapphire/Turquoise, Topaz/Citrine, Ruby, Amethyst, but I'm not strongly attached... Transformation item is supposed to be like a little faberge egg style jewelry box with the ring as a key TroRouge style!
Vague plot idea: There's a big important magic gem that can grant any wish, guarded by the Kyubeys for generations. The last person who successfully used it was a princess centuries back, but she vanished mysteriously and no one remembers what she wished for anymore... (Definitely she was NOT lost in time and will NOT show up later on with her own thoughts on if the Precure are doing things correctly...)
To activate it, you need to gather enough energy from granting people's wishes. Recently there's a coven of witches going around bespelling people into serving them and stealing their wish energy... Unclear on the end goal, but it doesn't look great! So one baby Kyubey heads off alone to try and awaken the Precure to fight them off and claim the big wish for themselves, to maybe bring back the princess???
Possibly Sayaka becomes a witch for a while, probably due to being disillusioned by actually meeting The Princess plus realizing the Kyubeys have not been totally honest. Kyoko's backstory is not quite as harsh as canon (also she didn't have magic to accidentally brainwash people), so instead her dad just became erratic to the point of losing custody, so she + Momo are growing up in an orphanage/foster care... Definitely the elder Kyubey is up to something...
