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I am 20 and a guy, I have a few OCs that work into your ideas pretty well!
Specifically "Foreign Prince", if you could an Underwater fae prince as foreign at least LOL.
His RPs are usually dark fantasy, kind of like a studio ghibli movie but a little fucked up, usually he saves a partners character from an accident at sea, only to be like "you will marry me now " or he will straight up just kidnap your character, either or.
I also don't know if you'd be interested in it, but I have a character who's world has a big theming of monsters. From vampires, to mothman, to Yokai basically. I typically like to focus on Lovecraftian horrors and build a big overarching plot around that, I have some ideas if they might pique your interest!