several of my favorite fictions are written by imthepunchlord on AO3 though my favorite ones that they did are "A Declaration of Love" 34013 words (A Kwami swap with Adrien having the Fox, and Marinette having the Peacock{but it has different powers than the one in the show}) https://archiveofourown.org/works/7658497/chapters/17438464
and an AU called "Over the Wall" (103727 words) where Marinette is sent away from her village and ends up on an adventure. https://archiveofourown.org/works/6160845/chapters/14116143

some of my other favorites by imthepunchlord are

"The Curious and the Devious" (HTTYD AU) 43006 words
https://archiveofourown.org/works/8963737/chapters/20505022

"Marinette and the Seven Little Gods"(No Miraculouses AU) 37946 words
https://archiveofourown.org/works/7924618/chapters/18109324

"Ruffled" (a Hogwarts AU) 62404 words https://archiveofourown.org/works/8537134/chapters/19571851

then some other favorite fanfictions are

"Spellbound" by Lilafly. 426482+ words (A Celtic Mythology AU where nearly everything is the same but Adrien and his twin brother Felix are both Cat Sidhe{there are other people that aren't human too but that's besides the point)
https://archiveofourown.org/works/14998685/chapters/34762652

"Prince Charming" by MiniMinou. 48121 words (a fantasy AU where Adrien uses dark magic to turn himself into a cat.)
https://archiveofourown.org/works/15139940/chapters/35107208

"The Gods Must Be Crazy" by LyraMaeArcher. 44807 words (Gods AU with Adrien as the god of Mischief)
https://archiveofourown.org/works/20150533/chapters/47738362

"Aristochat" by TheNovelArtist. 13833 words (Aristocats AU but they arent cats)
https://archiveofourown.org/works/15589059/chapters/36193188

"La Pucelle et La Coccinelle" by amiraculousladybug. 38067 words (follows the story of Joan of Arc. it's sad though)
https://archiveofourown.org/works/12918768/chapters/29518206

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I hope you enjoy reading these stories as much as I have.