If you're looking for the best One Punch Man fanfiction on ao3, this story is for you!

1. Class-S and Others Watch One Punch Man

In this fanfic, we see all of the Class-S watching One-Punch Man. Saitama is not thrilled about this, but  he attends the viewing of the show anyway, and sits with friends, and a few enemies. The unique thing about this fanfic is that they are only watching future events and how they will unfold. 

2. Ain't No Place for a Hero

In this fanfic, the reader is actually the main character of this story. The author has written this fanfiction in such a way that it feels like we are right in the middle of all of the action. As the reader, we are a humble heroine who just wants to be left alone by all of the heroes in the world. 

3. 5+7

This story features Genos as the main character, and he is the top-ranked S-Class hero, believe it or not. While Genos is off astounding everyone with his abilities, Saitama is doing some odd jobs for hire, and he gets into some wacky situations himself. The big twist is that Genos hires Saitama to be his friend.

4. The Strongest Hero

In this story, Izuku dreams of being the number one hero. Though he was born without any powers, that is not going to stop him from trying to become more powerful than any other hero. Luckily, he gets some help from some very powerful heroes along the way.

5. Enemy Number One

This collection is based on Saitama as the most powerful villain and also completely unaware. The world knows him as a God-level threat, but he is living his life completely oblivious. There are a number of misunderstandings in this story, as you may expect, and they all form a story that is exciting and humorous. 

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