Basic medicine and sanitation are simple. During the Warring Clans era, they become revolutionary. [OC-Insert]

Shirou never expected to be summoned to another world, but now all he wants to do is finish save it so that he could return home to his family. But it order to return home, he will first have to survive. First rule of surviving as a summoned hero, don't trust ANYONE.

Do not stand at my grave and weep. I am not there. I do not sleep. SI/OC-insert fanfic. Rated M for violence, strong themes, and language.

Harry gets killed after defeating Lord Voldemort. But it seems there's more to the deathly hollows than advertised. How will Harry cope with being reborn into a selective breeding birth by some sort of child soldier factory and how will he get away?

Percy Jackson is left reeling in the aftermath of the Giant War and only through sheer will and determination is he still alive. He needs a purpose as guilt and anger begins to consume him. SHIELD happens to be in the market for a person of Percy's caliber. (AU) (Post Giant War) (Pre-Battle of New York)

A tempest is coming, one that will take the world by storm. Its name, well its name is Perseus Jackson the Son of Poseidon. The question is, can the world handle him?

Death and corruption. A rotting Empire, and a man who would sit at the heart of a revolution. In a dark world of constant death and deceit, what place will a man whose only wish was to save others be able to carve out for himself?

By the end of the Third Shinobi War, she gained a spot in most Bingo Books with various monikers attached to her name: "Poison Apple," "Bloody Princess," and "The Mad Butcher." However, a small handful of Leaf ninja had another moniker for her: "The Bloody Oracle of Kiri". (Or: An SI/OC who's already got a screwed up moral compass and fits right in with the Bloody Mist.)

All her life Kari managed to avoid SHIELD, until one night at a bar turns her life upside down. Thrown into a world she never wanted to be part of, she soon finds out SHIELD is a lot different than she ever imagined. Life could get a little crazy when your workmates are Black Widow and Hawkeye. Minor canon divergence. Spanning the entire Marvel Universe through to Endgame.

They tried to destroy him. They failed. He was changed. Thrown into an unknown world of bloody evolution. Now he must make his way through this new land and show just why he is known as a god of destruction and the King of the Monsters. May God help them all. Faunus Godzilla!

"I never asked for this. For any of this! All I ever wanted was to sit and play music. So, why? Why is this little blonde boy suddenly so attached to me? Why is my teammate so broody all the time? ...why is our Sensei reading that perverted book? Why are there NINJAS—OH MY GOD! LOOK OUT FOR THAT SNAKE!" A story of a girl who knows too much. SI-OC

Percy has lost almost everything and finds himself in a new universe. He's not alone though, and he's definitely not he same as he was before... Eventual PercyxRaven

Annabeth was slipping and Percy dived to save her; something went wrong. On the surface, Annabeth leads the Seven, desperate to rescue him and unite the camps. Alone in Tartarus, Percy finds himself making harsher choices, discovering darker methods, unlocking deeper powers, tortured and fighting for his life. He swears he's still a good kid. Post MOA

Kaneki thought he'd met his death at the hands of the CCG's Reaper. And in all honesty, he'd accepted it. But when he unexpectedly wakes up in the world of Remnant, a strange place with even stranger rules, it might prove to be even more perilous then then the place he left behind. The question is-with the people he meets there, will Kaneki be so content to die?

Harry has the ability to learn the history of any object he touches, whether he wants to or not.

Vernon Dursley had a chance to rid himself of the Freak, and he took it. As a result, the one who would be a beacon of hope, Gryffindor's Golden Boy, and The-Man-Who-Conquered had his fate irrevocably and horrifically changed. Instead of a champion of the innocents of the Wizarding World, he became something far, far darker and more powerful, something horrifying. MultiXover

After losing to Arima, Kaneki wakes up and finds himself in a world filled with darkness and second chances... (Now cross-posted on AO3)

Harry messes up the animagus process and begins a new journey. New friends and old share his discovery of life. What is in store for The-Boy-Who-Lived? What dangers will he face? Find out inside! WARNINGS: Begins entirely in HP world, crossover starts later. Harry is bisexual. Rated M to be safe.

One of Rin's experiments goes wrong, throwing her and Shirou's souls into another world to be reborn. Finding themselves in a world with a new form of mystic energy and where the influence of Gaia is less than a tenth of its old strength, Rin has found herself in paradise. Shirou however sees a world of conflict, deceit, and monsters wearing human skin... same old, same old.