Final Fantasy Record Keeper

 is a mobile game developed by Square Enix, featuring property from various Final Fantasy games. This is a list of all Kingdom Hearts property added to Final Fantasy Record Keeper during collaboration events.

Key to Another World
Key to Another World (異次元の扉 ~繋がる心~) was an event as part of the collaboration between Final Fantasy Record Keeper and Kingdom Hearts Union χ. It followed the story of , from the Destiny Islands to Olympus Coliseum. In the event, players could collect Munny from enemies to spend in the Moogle Shop.

Story
Destiny Islands, heart of a peaceful world bathed in warm sunlight. There, Sora, Riku, and Kairi made their plans to set off on a grand adventure. But on the day before they had planned to leave, a darkness fell across the island, and the three friends were separated. As darkness engulfs the island, Sora takes possession of the Keyblade, and he sets out on a true adventure to find his friends. In his travels, Sora visits many worlds, meeting new faces and having life-changing experiences along the way. But to reach the end of his journey, Sora must face Kairi, in her death-like slumber, Riku, who is drawn to the seductive power of darkness, and a mysterious figure with an insatiable lust for the dark.

World Hearts
World Hearts (異次元の扉 ～世界の心～) was one of three events released as part of the collaboration between Final Fantasy Record Keeper and Kingdom Hearts III. It followed the final battles of.

Story
The mastermind seeking to shroud the worlds in darkness is a man once known as Ansem the Wise, who studied the Heartless. Exploiting a weakness in Riku's heart, Ansem possessed Riku and uses the power of the princesses to gain access to the World Hearts. Following after him, Sora and his companions head to the End of the World, a place seething with darkness. To save Riku and rid all worlds of darkness, they must find a path of light through the darkest depths.

Characters

 * Sora

A boy from the Destiny Islands. When darkness envelops the islands he becomes separated from his friends Riku and Kairi, and finds himself in an unfamiliar world. During his adventures with newfound companions across myriad worlds, he comes to learn the power of the Keyblade.


 * Riku

Sora's close friend and good-natured rival. In his eagerness to compete with the Keyblade-wielding Sora and save Kairi, Riku's heart succumbs to the darkness.

A crazed researcher who aims to cover all worlds in darkness. While delving into the Heartless and darkness he is seduced by their allure. Believing that all things are born from the darkness, he seeks the World Hearts that hold the key to its power.
 * Ansem

In Trembling Twilight
In Trembling Twilight (異次元の扉 ～たそがれに揺れる光～) was one of three events released as part of the collaboration between Final Fantasy Record Keeper and Kingdom Hearts III. It followed Roxas's battles against the Nobodies in the beginning of Kingdom Hearts II.

Story
Roxas is enjoying the last of his summer vacation in Twilight Town when a series of strange events begins to unfold, with the appearance of unearthly creatures and mysterious men in black coats. As his short vacation comes to a close, Roxas learns the truth behind these incidents.

Characters

 * Roxas

A young boy who lives in Twilight Town and is a skilled skateboarder. With just a few days left of summer vacation, Roxas meets Sora—someone he's supposedly never met before. For Roxas, seeing Sora and his friends on their adventure is like seeing something from a half-remembered dream. After a series of bizarre events, including encounters with entities only he can see, he begins to suspect all is not as it seems.

Spun from Light
Spun from Light (異次元の扉 ～光が紡ぐ心～) was one of three events released as part of the collaboration between Final Fantasy Record Keeper and Kingdom Hearts III.

Story
Sora and his companions learnt that their struggles over the Kingdom Hearts have played into the hand of Master Xehanort, who plots to ignite a new Keyblade War. To stave off the darkness, they seek to bring the Seven Guardians of Light together. While King Mickey and Riku set out to locate the great Keyblade wielders, Sora and his two allies journey through myriad worlds to recover the Power of Waking.

Characters
A young boy chosen to wield the Keyblade. Sora becomes separated from his childhood friends Riku and Kairi and sets out on a journey to find them, but he soon finds himself facing strange events he never bargained for. To prepare for the impending threat, Sora must assemble the Seven Guardians of Light.
 * Sora

Sora's close friend and good-natured rival. The weakness in Riku's heart exposes him to being overtaken by darkness, but he fights it, and is determined to prevent it from overwhelming him. Like Sora, Riku seeks to prepare the world for the threat it faces, so he sets off with King Mickey to find the great Keyblade wielders.
 * Riku

A group put together by Master Xehanort to bring about another Keyblade War, then rebuild the world in their image following its destruction.
 * The Real Organization XIII

Characters
Key to Another World added Sora and Riku as playable characters.

Sora


Sora is classified as a "Keyblade Master" and has a "Physical Attack" combat role.

Riku


Riku is classified as a "Chosen" and has a "Physical Attack" combat role.

In Trembling Twilight added Roxas and Axel as playable characters.

Roxas


Roxas is classified as a "Key of Destiny" and has a "Physical Attack" combat role.

Axel


Axel is classified as a "Flurry of Dancing Flames" and has a "Physical/Magical Hybrid" combat role.

Wardrobe Records
s allow characters to change their appearance.

Key to Another World added three Wardrobe Records based on the Kingdom Hearts series.
 * The Black-Robed Keeper Wardrobe Record allowed to dress in a Black coat.
 * The KINGDOM HEARTS Cloud Wardrobe Record allowed to take on his appearance from Kingdom Hearts.
 * The KINGDOM HEARTS Leon Wardrobe Record allowed to take on his appearance from Kingdom Hearts.

Spun from Light added two Wardrobe Records based on Kingdom Hearts III.
 * The KINGDOM HEARTS III Sora Wardrobe Record allowed Sora to take on his appearance from Kingdom Hearts III.
 * The KINGDOM HEARTS III Riku Wardrobe Record allowed Riku to take on his appearance from Kingdom Hearts III.

Equipment
Key to Another World added the new Keyblade weapon class, alongside several weapons and armor from the Kingdom Hearts series.

Enemies
Key to Another World features several Heartless as enemies, and some Final Fantasy bosses.

Soul Breaks
 are powerful attacks obtained from weapons or armor. Aside from Soul Breaks for Kingdom Hearts characters, Cloud and Yuffie received a Kingdom Hearts-related Soul Break as well.

Record Materia
 are passive abilities that can be obtained by breaking a character's level cap.

Legend Materia
 are passive abilities that can be obtained from Legend Spheres or equipment.