Final Fantasy VII has a long tradition (going back about twenty years now) of time-travel fix-it fics. These are some of the examples of the genre I've found, and enjoyed to the point of re-reading. (This isn't a comprehensive list, just a few favourites; and I'm leaving off works in progress).
Eir's Tomorrow by Jukeboxhound
This one is a serious version of the trope. Cloud Strife watches the world end, and is hauled back by the Planet to do it all over again from the very beginning. Be warned: this one gets very gritty and dark in places - there are warnings for torture, sexual assault, blood, gore, and psychological horror. Read the warnings first before you start the story, and have the tissue box handy if you choose to continue - this one keeps kicking you in the feels.
Deus Ex Machina by Guede Mazaka
Described by the author as a "Crackfic time-travel satire AU", with BDSM overtones and an NC-17 rating. This one is pretty much what you get after Cloud Strife has been travelling the time-stream repeatedly from AU to AU to AU for something like twenty or thirty years, and he's finally got "fixing the world's problems" down to the point of being a fine art. As well as reaching the point of exasperation with the whole thing.
Rock Bottom by esama
A forty-year-old Cloud Strife is pulled back to his fifteen-year-old self by the Planet, and decides "sod that for a game of SOLDIERs" when faced with the idea of doing everything over again. Then he and Aerith go on to save the world in the most fabulous fashion (in every sense of the term) possible. Pure crack!fic which always makes me laugh.
The Fifth Act by Sinnatious
Cloud Strife post-Advent Children has an accident with a Time materia in the Midgar wastes, and finds himself back in the Crisis Core era. A lovely exercise in how small things make big changes in the end. Be warned: there's a lot of angsting in this one, some fairly realistic corporate reactions to perceived suicidal behaviours, and a lot of non-consensual experimentation. Another one where you might want to keep the tissue box within reach for some parts.
The Little Guy by TokiMirage
Cloud Strife wakes up as a cadet, and decides, after failing out of SOLDIER, he's going to avoid the military altogether. He becomes a janitor for Shinra, which should have been the end of it. But fate is a tricksy bitch who will not be denied, and who also has a good line in broken appliances in a certain general's office. One of the rare dominant!Cloud fics in the fandom, so if you're wedded to the notion of Cloud Strife as uke, it possibly won't be to your taste; also there are some identity issues and such (related to known canon issues, so be warned).
If anyone else has any recommendations for FFVII time travel stories, drop them in the comments.
Eir's Tomorrow by Jukeboxhound
This one is a serious version of the trope. Cloud Strife watches the world end, and is hauled back by the Planet to do it all over again from the very beginning. Be warned: this one gets very gritty and dark in places - there are warnings for torture, sexual assault, blood, gore, and psychological horror. Read the warnings first before you start the story, and have the tissue box handy if you choose to continue - this one keeps kicking you in the feels.
Deus Ex Machina by Guede Mazaka
Described by the author as a "Crackfic time-travel satire AU", with BDSM overtones and an NC-17 rating. This one is pretty much what you get after Cloud Strife has been travelling the time-stream repeatedly from AU to AU to AU for something like twenty or thirty years, and he's finally got "fixing the world's problems" down to the point of being a fine art. As well as reaching the point of exasperation with the whole thing.
Rock Bottom by esama
A forty-year-old Cloud Strife is pulled back to his fifteen-year-old self by the Planet, and decides "sod that for a game of SOLDIERs" when faced with the idea of doing everything over again. Then he and Aerith go on to save the world in the most fabulous fashion (in every sense of the term) possible. Pure crack!fic which always makes me laugh.
The Fifth Act by Sinnatious
Cloud Strife post-Advent Children has an accident with a Time materia in the Midgar wastes, and finds himself back in the Crisis Core era. A lovely exercise in how small things make big changes in the end. Be warned: there's a lot of angsting in this one, some fairly realistic corporate reactions to perceived suicidal behaviours, and a lot of non-consensual experimentation. Another one where you might want to keep the tissue box within reach for some parts.
The Little Guy by TokiMirage
Cloud Strife wakes up as a cadet, and decides, after failing out of SOLDIER, he's going to avoid the military altogether. He becomes a janitor for Shinra, which should have been the end of it. But fate is a tricksy bitch who will not be denied, and who also has a good line in broken appliances in a certain general's office. One of the rare dominant!Cloud fics in the fandom, so if you're wedded to the notion of Cloud Strife as uke, it possibly won't be to your taste; also there are some identity issues and such (related to known canon issues, so be warned).
If anyone else has any recommendations for FFVII time travel stories, drop them in the comments.