Fics like The Lonely Heart of Creation

Soulmate au in which people grow to eighteen and cease aging until they've met their soulmate. History remembers Ladybug and the wielder of the Black Cat miraculous as heroes spotted the world over. For as long as there has been a written record, so too have they existed. But while there have been countless Black Cats, there has only been Marinette to hold the Ladybug. With countless years behind her, she has yet to find a soulmate, and no longer believes she has one. An ageless oddity, Marinette has traversed the world, helping where she can, and fruitlessly loving those who inevitably find their mates. Can a handsome fashion mogul, and a new Black Cat wielder be the answer to a question she's ceased asking?

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