Thirteen is too young to gain eight years of memories that might come to pass--especially when you don't even know what to do with yourself in the present. But when the future is that bloody and dark, do you have any choice but to try to change it? He remembers the absolute agony of the doctors trying to save him, which finally sent him into blissful unconsciousness— —except he doesn’t remember any of that. Tsuna’s last memory is of putting his head down on his desk and falling asleep to the sound of the teacher’s droning, thirteen years old and tired of not understanding a word, not of being twenty-two and beloved and dying.

Unwillingly forced to serve as a human trial for a crazy alchemist experimenting with time travel, Edward Elric finds himself standing across from Truth in the moment it takes his leg from him. Armed with the knowledge of what's to come and burdened with guilt for the choices he'd made as an adult, Ed sets out to fix every mistake he ever made and save every life they ever lost, no matter what it takes.

or, Catharsis: The Fic In which Wei Wuxian, shortly after being called into Mo Xuanyu’s body, is further forced into the past, where he proceeds to tumble his way into absolutely nailing a time travel fix-it.

After their end, a plea and a wish for things to have been different by Lan Xichen sends Nie Mingjue and Jin GuangYao back in time and gives them a chance to do better. With their knowledge of the 'future' they came from, they have to figure out how to deal with each other.

Nie Mingjue would be the very first to admit that devious plotting was not his strong suit – but if it meant he could make things better, make it so that his brother never had to dirty his hands to avenge him, he would do his best. His best, in this instance, was a forbidden ritual that sent him back in time to before their father had died, before Wen Ruohan's perfidy was revealed, before Meng Yao was twisted by the world's cruelty, before Wei Wuxian was orphaned... Nie Mingjue had a lot to do and very little time in which to do it. Best to get started right away.

Nie Huaisang hates, hates, hates paperwork. Life would be so much better if only Meng Yao (now officially recognized as Jin Guangyao) were available to do it for him...but unfortunately, his brother never did end up swearing brotherhood with him, which means that Nie Huaisang has no basis to go ask him for help. If only there were another position available where Jin Guangyao could just run the Nie sect – (in which Nie Huaisang decides to matchmake his brother and Jin Guangyao together for his own selfish reasons)

Nie Huaisang thought that - should the time travel array actually work and he end up back in time before everything happened, with his brother still alive and well - that the first thing he would do would be to properly weep and cry and hug his brother, not jump straight into explanations and strategizing. Then again, he hadn't expected that the array would somehow send his spirit into his brother's body, casting his brother's spirit into his own past self, either.

Where Class 1-A finds itself in a time loop centered around their first year at UA. After getting over the usual angst, they decide that the best way to grow as heroes is by antagonizing dangerous villains for fun and amusement.

Jon finds himself wandering. His feet carry him to one of the battlements, snow coming down in soft-feathered waves that dust the rooftops. Winterfell is alive with light, windows glowing and chimneys smoking, and Jon can't remember the last time he saw it so full of life, walls still standing tall. This Winterfell has never seen a Bolton occupation, has never witnessed the march of the dead, the wrath of dragon fire. It is eight years before the fall of the Wall, and it feels like a dream. Jon still can't bring himself to completely believe it. Mance Rayder is not yet King Beyond The Wall, the Free Folk have not yet begun to gather, and what stories there are of White Walkers and the dead that walk are still only that, just stories. It has not yet begun, Jon thinks, dread sinking in his stomach. And then- It has not yet begun, Jon thinks again, the thought taking on a new turn in his mind. - Jon has been given a second chance, a chance to change everything.

Quinlan can’t take it anymore, and if he sticks around for one more minute, he’s going to have a reaction that’s entirely inappropriate given the discussion that’s happening above his head.