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1. Life is Simple, Love is Not By TheSandwich Ghost - 60 Chapters (Complete) 189k Words.
Summary: Adult/quirkless Izuku AU . Rumi gets assigned a government liaison, and she is determined to make him quit by any means necessary. Izuku is given the seemingly impossible task of winning Mirko's trust to help set the groundwork for a new project by the Ministry of Defense. A story about opposites attracting and that complicated thing called love. (Includes lemon)
(Izuku M/Rumi U,Mirko).
(https://m.fanfiction.net/s/13672650/1/Life-is-Simple-Love-is-Not)
2. Lost By Mysterio31 - 129 Chapters (Ongoing)
448k Words
Summary: Estelle was always lost. But this time she really is lost. Where the hell was she? Waking up in a completely different setting, Estelle makes her way in search of a way to get back home. The endeavour leads her to UA High School of heroics where she meets heroes in training. Estelle isn't interested in them though, getting back home was her utmost priority. Slight!ATLA. OP!
(Katsuki B/OC)*(Estelle).
(https://m.fanfiction.net/s/13972064/1/LOST)
3. A Quirk Of Tanks By EmperorofNefarious1 - 33 Chapters (Ongoing) 35k Words
Summary: There are a lot of strange quirks out there, some with random elements, some that are ridiculous and some that defy the laws of physics. Of course Izuku had to get one with all of those traits.
(Izuku M/Ochako U, Momo Y),Eri.
(https://m.fanfiction.net/s/13819652/1/A-Quirk-of-Tanks)
4. Unlikely By Straight Gates - 33 Chapters (Ongoing) 191k Words
Summary: All Might is fatally wounded defeating All for One five years before the canon story begins. Without a successor and desperate to pass on his quirk before he dies, he gives it to the little boy he sacrificed his life to save: Izuku Midoriya.
(Izuku M/Sestuna T).
(https://m.fanfiction.net/s/13907862/1/Unlikely)
5. My Hero Academia Perfected By Silentslender - 126 Chapters (Ongoing) 771k Words
Summary: In a society filled with Heroes and Villains, some are unfortunate not to be as gifted. Sometimes the world can seem almost out to take away all you ever desired, and other times it will feel as though there are no heroes to save you at all. So what if a chance of improbable odds were to befall you? What if someone without a Quirk, so to speak, were to become a Hero
(Izuku M/OC).
(https://m.fanfiction.net/s/13631313/1/My-Hero-Academia-Perfected)
6. My Hero Academia: Son of Justice By Jayme F Midorikawa - 104 Chapters (Ongoing)
2.5M Words
Summary: The son of the disgraced former greatest Hero of The Soviet Union is extended a chance at a new life by the Symbol of Peace, All Might. After having lived so long resenting Heroes and Villains, and being scared to death of his own Quirk, will he be able to step forward and become the Hero he once dreamed of, and will he be able to find new purpose through friendship, or even love?
(OC/Mina A), (Izuku M/Ochako U)
(https://m.fanfiction.net/s/13785673/1/My-Hero-Academia-Son-of-Justice).