Soulmate AU where you have a single word on your body that is important to your soulmate.
I'm going to list a hypothetical here:
Izuku has the word 'Music' on his wrist.
Kyoka has 'Quirks' on her's.
When one soulmate mentions the word that represents them, with in hearing distance of the soulmate, it glows in their favorite color on the soulmate its attached to.
--I want to use this soulmate system a few times with different pairs. I think I'd be nice.

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PaleKittenVoid's Sweet Shop (AU Book)
FanfictionThis is a book where I post all of my AU's, Book prompts, and general ideas or discussions for books.