Once a Nobody perishes they disappear without leaving a trace, ceasing to exist. When the incineration of humanity threatens the world to end, the Grail reaches through a gap in the barrier between realities and pulls a hero through to assist in the restoration of Humanity.

You all know the events that lead up to Sora's disappearance from his and his intense battle with Yozora. But what if instead of ending up in the city Quadratum, he ended up in the fabled Clock Tower, meeting the infamous Wizard Marshal. Guided by him, Sora ends up in a world where humanity is on the brink of destruction and must save it with Chaldea's Final Master

In which a kingdom hearts fan finds himself inside of the nasuverse with a keyblade. Multicross might happen in the future. (SI/OC) Beta Reader-Darklord331

Let's be honest with ourselves, there are Worlds out there that will never be known. Stories that will never be known. Legends that can be unworthy of our attention. But... What if these destined tales were told? What if they were given a chance?

The Servants of the Fifth Holy Grail War are summoned into the Keyblade Graveyard. The Lingering Will dislikes this intrusion. [Crack, One-Shot]

When Xehanort decided to visit a certain world, he met a girl with dead eyes. Despite wanting to leave, a voice stopped him from doing that. How will his encounter result with this... Sakura?

The Grail is corrupted by All The World's Evil, allowing it to summon villains and twist wishes. The Master of Masters puts in there a deceased Heart of pure Darkness to see how it would derail Fate Zero's timeline. An edgy sociopath Keybearer was summoned as a Caster. This will end in a motherfucking clusterfuck.

They wield swords. They travel across dimensions. And they experience epic misadventures! And now they're meeting each other! Can the Multiverse handle this combination or at least, can their friends? (Witcher x KH x Fate Grand Order x Neptunia crossover)

After a failed experiment with the Kaleidoscope, Chloe was transported to Virtual Twilight Town and then contracted by a black coated man to act as bodyguard for a certain Nobody as long as they could return her home. But she didn't know about the adventures she was heading into… Rated just for precaution.

One shot. Saber doesn't know what it means to be normal. With Shirou busy, it's up to Sora to save the day!

Después de abandonar su hogar Terra vaga sin rumbo hasta que termina en un mundo desconocido, ahora junto a los gemelos Fujimaru y la servant Mashu y varios héroes de la humanidad Terra buscara darles paz a su corazón al tiempo que buscan salvar a la humanidad

A proper Fate stay night kingdom hearts crossover. Shirou becomes a human Heartless and speaks like Ansem, Xemnas, Xehanort. Kingdom Hearts is simply another word for the Swirl of the Root, Akasha; one only known by the Realm of Darkness. Shirou searches for Seven Princesses of Heart during the Fifth Holy Grail War in order to reach it. Shirou/Sakura, later Harem. Saber Alter used

Even those in legends, had legends they themselves felt inspired by

She doesn't remember anything but her name and that she possesses a key-shaped sword. Found by Kiritsugu Emiya, she's happily adopted into the Emiya family with a fellow amnesiac. Well, apart that they can do magic, Shirou is a suicide hero, her best friend can't confess to her brother and secret magic War... she has a mostly normal life, and why is she attracted to Final Fantasy?

"At seventeen, Sora believed he'd seen most of what the worlds had to offer. At twenty-seven, he realized how wrong he'd been." In which Sora accidentally passes the Keyblade on to Shirou.

CHALLENGE

When two people who should have never met each other, meet. How would fate be changed...?

A year after the Holy Grail War, Shirou dreams of fighting strange creatures. Now they appear along with a strange weapon, and lead him on an adventure to save those who he cares about. (Post HF True) (KHII)

There is always more to a person's story. Roxas can do more than spend five minutes hunting down Heartless. And Shirou should have died that night. A side-story of Roxas learning about heroism, and Shirou about the importance of friendship. (Fixing Spelling Grammar and Plot)

When Xehanort in his prime learns of a world that holds an artifact that is said to be capable of granting any wishes, his curiosity led him to a world where magic users are a hidden society that hold an annual once-in-a-lifetime competition called The Holy Grail War.

Why is he there? a mistery. But he can't leave, not when there is a war being fought, if he did he wouldn't be himself anymore. Sora, now, finds himself in quite the predicament but he won't run when there's people to save just like the new friend he has made there... Emiya Shirou.

one was the lingering remains of a betrayed Keyblade wielder, the other was a distorted red head wanting to become a hero of justice. Two lives that normally would have never crossed, but they did, and now a new Keyblade wielder has arisen to become the light that burns away the darkness , Fate stay night x kingdom hearts crossover. Chapter 2 Rewitten

Emiya Shirou's wish has been granted, beyond his wildest imaginings. He does not rejoice; it tastes like ashes in his mouth. Now, in lieu of any of those chosen, he must journey across the stars to protect those still safe, and save those who have been lost. All in a day's work for a Hero of Justice, right?

As the fourth heavens feel begins, an unexpected visiter arrives from another world, and will change the destiny of multiple people he will come in contact with forever fate/zero and birth by sleep crossover

Heiwa and Kinto have been sent to the world of Fate/Zero to exterminate approaching Heartless for three weeks: a task usually done without problem. But Heiwa was tasked to participate in the Holy Grail War and win it. Under the title "Wielder", the keeper of the Keyblades will face seven Heroic Spirits from history as his enemies. Can he win? Re-write of Fate Zero: VSoR