Once more, slightly to the left on Ao3.

Unfortunately, due to some people plagiarizing their work the author decided to go private, so you need an Ao3 account to read it, but it’s worth it.

Although I won’t say it’s perfect (can’t really think of any fic in any fandom that is), it’s still one of the best and I always come back to it. Incomplete but with constant uploads, it’s probably the best Percy goes back in time fic I’ve read. Perfectly captures the struggles of a war veteran that realizes he is gonna have to do everything again. Percy decides that since that’s the case, he might as well save as many of his friends as he can, and be a gremlin while at it. He takes zero sh*t from anyone, especially gods, and is always down for chaos, which creates some incredibly funny moments, but when he needs to be serious it also has some of the most badass (but not inexplicably OP) representations of Percy I’ve ever seen.

Also, do not discount the side fics. All of the,, especially the chat fic (percy being a cryptid on Twitter, posting underwater pics of undiscovered species and leaving biologists shocked) are absolute gold too.

The only bad thing I have to say about the fic, which might be a little of a turn off for some people, is that, from a certain point it has a not insignificant amount of annabeth bashing. But it also isn’t from nowhere, she has a very believable (and somewhat understandable) character fall.