Disclaimer: I do not own Kingdom Hearts, or My Little Pony: Friendship is Magic nor any character used in this story.

Note: This Fic is written, assuming the reader HAS played the Kingdom Hearts game series. (Especially I, II, and Re:Coded) And has watched the first season of MLP:FiM at the least.

Prologue:

The Send Off and the Weird Arrival

Standing on a flat, short platform, a young girl of fifteen looks out to the sea on a hill near the beach of Destiny Islands. "Kairi!" hearing the voice, the young girl turns her head to see a young boy of fifteen with brown, spiky hair. While smiling at her and waving his hand, he jogged to her across the wooden bridge that connected a cave to the stone flat surface of the platform. "So you're leaving?" Kairi asked giving the young boy a sad look while pouting. Looking back at her apologetically, the young boy scratched the back of his head while giving a meek smile. "Yeah, I am. Don't worry though! Riku will be with me! And Goofy! And Donald! I promise we'll be back soon." He smiles meekly at her, blushing. "I know" Kairi responded "but… I always have to wait for you. You two never take me along…" She looks at him with a sad face as her eyes start to glisten with tears. "It's not fair, you know? I can't even help you two and I always have to wait… Even back then, I always waited for you… Riku and I waited for a long time for you, Sora… Now you're leaving again with him." Sora apologetically clapped his hands together and bowed his head. "I'm sorry! I really wanted to take you with us! But King Mickey only asked for me and Riku in th-" "I know." Kairi interrupted with a smile. Teasingly, she stuck her tongue out at him with her eyes closed. "So you better come back really soon? I'll be waiting for you two. And you better make sure you look out for Riku too, okay? I don't want to keep waiting forever because you lost him again. And I won't forgive you if you do!" She said smiling. Sora looked at her surprised and smiled himself. "Okay! I promise" Sora answered. Suddenly, Kairi embraced Sora, which took him by surprise. "I mean it…" Sora said before returning the embrace.

Later at sunset, Kairi was still at the same spot this time sitting on their usual palm tree. "You'll take care of him, right? You promise, right? Riku?" a young man of seventeen with long, silver, wild hair calmly stared out at the broad horizon of the sea and sun with arms crossed leaning back on the stone rock of the platform. "Of course" promised Riku "we been through a lot together now, no way I could ever leave you two alone. Not after all the trouble he took to find me at least." Kairi giggled before leaning forward to see her and Sora's childhood friend with a small smile. "You better promise. Or I won't forgive you either." Riku looked up, gave her a grin and said "Yeah I promise. We'll be back before you even know we left." Kairi looked back at the ocean waves, calmly lapping the beach shores of the island with a melancholic look on her face. "I really wish I could have come along, I never seem to get a chance to go on adventures with you two." She sighed. "But I know if it's you two, you'll be back. So I'm making you two promise to take me next time, okay?" She smiled, while Riku pursed his lips with worry. "The ocean looks a lot more beautiful today." She said. Riku looked up and saw her eyes shining with a smile on her face. He looked back at the ocean and with a smile on his own said "Yeah… it does…"

The next morning, Sora, Riku, and Kairi were waiting on the same flat stone platform the three of them were at yesterday. She hugged them both and placed in Sora's hands her Wayfinder charm made of thalassa shells. "Remember this is to make sure you keep your promise to come back!" Kairi warned "I won't forgive you if you lose it! That includes Riku too!" She grabs Riku's hand and gave a charm to him as well. "There! That means you both promised to come back, okay?" She beamed. The two boys nodded and smiled back at her. Suddenly, a flash of light surrounded the two and they disappeared off the island. The smile on Kairi's face slowly turned to sadness as tears streamed down her face, as she struggled desperately not to cry… She already missed them both.

On the Gummi ship, two creatures were working on the controls on the deck. One was an anthropomorphic white feathered, orange-billed duck, who happened to be King Mickey's court Wizard and wearing his typical navy blue travel uniform. He was sitting on the front of the deck, looking over the controls. He turned his head towards the boys and quacked "There you two are! What took you two so long?"

Next to the duck was an anthropomorphic, black fur, buck-tooth, lanky, droopy eared dog, who happened to be King Mickey's captain of the guards, wearing his typical traveling uniform of green sweater, orange pants, black vest, and brown hat and red goggles. He turned from his own set of controls on his seat towards the boy and guffawed with a smile on his face "Ahyuck! So did you two say your goodbyes to Kairi then?" Both Riku and Sora nodded. Sora smiling said "Yeah, we're ready whenever you two are." He looked to the duck "Donald." then to the dog. "Goofy." They both nodded to him with a smile. "Gwarsh," Goofy said with a heavy voice "I sure wish we could have brought Kairi with us too though." "Mickey's letter said only Sora and I are needed and from what I can tell it's something that could be dangerous" Riku said with a stern look "I'm not letting Kairi get hurt again." Sora agreed with Riku. "Well enough talking, we're taking off!" Donald quacked "So buckle up and off we go!" After Riku and Sora took the two remaining empty seats on the ship and buckled up, they gave Donald the thumbs up to go. Then, with a bright flash, the Gummi ship zoomed away from the island shaped world, disappearing in a bright flash of a star.

"Hey! Twilight! Where should I move this cloud?" A cyan-colored pegasus pony asked a purple unicorn pony. "Right over there, Rainbow Dash." She pointed a hoof to a spot in the sky near a large forest entrance. "Alright, that should do it," Twilight said with satisfaction "and I do believe we finished our Winter Wrap Up quite nicely, wouldn't you agree?" "Awesomely!" exclaimed Rainbow Dash "You're definitely the best organizer for the job, Twi! Whew! I remember the year before you came to Ponyville! What a mess that year's Winter Wrap Up was." Rainbow Dash rolled her eyes as she remembered that horrible year. Twilight giggled "Hey did you want to get some lunch at the library? I'm sure Spike can whip us up something." "Sure, why not?" Rainbow Dash agreed. They both started walking towards the library. The fact that Rainbow wanted to walk caught Twilight by surprise. "Wow, Rainbow, not going to dash off like you usually do?" "Hey, you try having the energy to flap wings after spending most of two days moving clouds away and trying to make sure all of Ponyville getting sunlight." Rainbow Dash said dramatically before chuckling. "Good point." Twilight agreed giggling. As Twilight looked up to admire the bright warm sunlight rays, she spotted a stray black cloud. She sighs disapprovingly as she sees a familiar grey pegasus mare with a blonde mane having trouble blowing the cloud in the direction she wants. "Rainbow Dash, do you think you could-" Twilight started to ask when she felt an incredible burst of wind blow up her tail and mane away, as Rainbow Dash created a Sonic Rainboom from where she was earlier. She was yelling as she zoomed to the grey mare "Derpy, no! Don't jump on the cloud near City Hall!" Twilight Sparkly sighed, smiling in relief as she saw her friend rushing to help the accident-prone pony. She quickly followed and stopped just as suddenly when she noticed something strange in the sky.

As she continued to stare at a dot in the sky, she noticed it getting bigger, forming a strange shape, noticing that it was coming straight at her direction! She yelped as she ducked as whatever the strange object was zoomed past her and crashed into the ground, creating a long trench leading deep into the Everfree forest. Curious, Twilight decided to try and see if she could see the object, failing to notice anything apart the trees, she hurriedly ran to town calling for Rainbow Dash. "Rainbow Dash! Did you see that strange thing?" "Yeah! Holy Celestia, did you see the size of it! It was huge!" Rainbow exclaimed. "Yeah I want to check out what it might be, can you help me find the girls?" Twilight asked. "No, problem!" Rainbow nodded and zoomed off to find their friends in Ponyville. Twilight looked back at the entrance to the Everfree forest and for some reason… she had a bad feeling.

Moments earlier on the Gummi ship, Sora and Donald were having a conversation about why would Master Yen Sid possibly ask for him and Riku, who was absentmindedly staring out the window into the dark space outside the ship. All the while, Goofy was driving the Gummi ship. "So, do you think he wants us to become his disciples?" Sora spoke excitedly "I mean, I can't think of any other reason for him to want to see us." Donald nodded in agreement. "It's highly possible since you and Riku are the only key bearers that we know other then King Mickey!" Sora turned to Riku and asked "What do you think Riku?" Riku shrugged "I honestly don't know," he answered with what sounded like a bit of worry in his voice. "I mean… Why would he want to take me in as a disciple when I've taken in the darkness as much as I have?" "Aww don't worry, Riku," Sora reassured him "I'm sure-"

Bwoop! Bwoop! Bwoop!

Suddenly, an alarm was set off. "Goofy, what's happening!" Donald shockingly quacked. "HEARTLESS!" Goofy yelled back. "They just showed up outta no where! GWARSH HOLD ON!" Goofy maneuvered the ship into a series of barrel rolls and evasive maneuvers in order to avoid blasts from behind as several thousand Heartless chased after them. "YAAAAAAAHOOHOOHOOOEEEE!" Goofy screamed as he tried his best to evade the Heartless in a panic. "Quick, Sora, we gotta fight back!" Yelled Riku "Goofy can't dodge them forever!" Sora nodded in agreement. Sora and Riku quickly went to activate the ship's defense weapons. Abruptly, Donald loudly quacked. "SORA! LOOK OUT! BWAAAAAAAAAAAAH!" "Wha-!" was all Sora could say before he had to summon his Keyblade, the Kingdom Key, to block an attack from a Heartless that somehow got aboard the Gummi ship! "It's a Zip Slasher!" Riku yelled over the alarm as he summoned his own keyblade, Way to the Dawn. "I'll take care of him, Sora, you defend the ship!" Riku commanded.

"No way!" Sora argued "I can't let you fight this thing alone! It looks pretty tough!" The heartless was similar to a bigger cousin to the smaller Soldier heartless Sora was more used to fighting. It was more armored with a dragon-like helm and blades for hands. It charged at Riku spinning like a top as he brought up his Keyblade to block. Unexpectedly, the Slasher vaulted behind him, ready to stab him from behind. "Riku! NOO!" Sora yelled as he pushed Riku to the side before the Slasher could complete its stab. As Riku fell, he looked back, screaming "NOOOOOOOOOOO! SOOOOORRAAAAAAA!" Bursting out Sora's back was the Zip Slasher's bladed hand, as the Heartless righted itself to land on its feet. Sora was in a state of shock as light burst forth from his chest, his heart coming forth from his body. As the life faded from his eyes, the look of horror and shock grew on Riku's face and on Donald's, and Goofy's as well as they turned around to see the scene. As the heart came completely out of Sora's body, his body started to fade.

Sora's heart, with which the Zip Slasher's blade stabbed through, started to crack. As rage appeared on his face, Riku was swiftly enveloped in a dark mist as though seeping from his body, he quickly brought up his keyblade's hilt close to his face, the blade facing up before suddenly zooming into the Heartless, his keyblade extended going through it, before disappearing in a flash of light, reappearing behind it, readying his keyblade again, and with seven sudden swift strokes, he slashed at the Heartless, striking the Slasher in rapid succession as if it was being struck by a blurry invisible force. As the Rip Slasher lay defeated and fading, a heart of its own lifted and disappeared into the universe. Riku went to the floating heart of his best friend, holding it tightly in his grasp, all the while repeating the same word over and over again like a mantra. "No, no, no, no, no, no, no, no, no, no, NOOOO!" his eyes widen in shock and fear as he saw the heart of his best friend shatter into six pieces. With a rapid flash of light, the pieces of Sora's heart all flew in the same direction, to a strange world nearby. "GOOFY! FOLLOW THEM! WE HAVE TO GO AFTER SORA'S HEART!" Riku yelled in a loud commanding voice. "R-R-ROGER!" Goofy responded in a panic.

With a look of determination on his face, Goofy maneuvered the Gummi ship to follow the heart pieces when THUNK,BOOM! "We're hit! One of the Heartless got us! We're gonna crash into that world! BWAAAAAAAAAAH!" Donald loudly quacked with panic as Goofy screamed "HOLD ON! YAAAAAAAHOOHOOHOOOEEEE!" as the smoking Gummi ship twinkled and disappeared into the world… a world where it looked like it consisted of a large village with a castle sitting on the side of a large mountain in the background of the village with a large dark spooky looking forest on the bottom. Inside the ship, Riku had tears streaming down his face, clutching for dear life the star-shaped charm made of thalassa shells as he whispered "Sora… I'm sorry." as he drifted into unconsciousness.

Back on Destiny Islands, on that same platform that the three of them always sat on as they looked at the sunset, Kairi was out enjoying the view of the ocean with a sullen look. Out of the blue, she gasped and looked up into the sky. "No… Sora." She whispered to herself as if she knew. With a pained look on her face to match the pain in her heart, she broke down sobbing.