Soul Kingdom
A Kingdom Hearts/Bleach Crossover- Alternate Universe
After giving her Shinigami powers to Sora to protect Destiny Islands from the Heartless, Kairi becomes unable to fight. Sora's Zanpakutou becomes a shining "Keyblade" when awakened.
After temporarily losing his Death powers, Sora regains them through training only to realize the Heartless within him has a mind of its own- An uncontrollable dark side called the Antiform.
As you can see, the differences are distinct yet not so different. Now, on with the story!
"Soul Kingdom- Chapitre 1"
Bleeding Black On The Sun-Bleached Ground
However Sora looked at Soul Kingdom, it just never seemed inviting. He was certainly glad, at least, that he didn't have to live there. Being alive had perks, he supposed. He silently scolded himself. Kairi lived here, and she was perfectly nice.
Still, she had to live with those Shinigami in the black cloaks. The Captains.
He had only ever seen one up close- maybe too close. Xemnas, leader of the First Band of Soul Society. That had been a close call. Kairi knew him better than Sora did- not that Kairi came out here much anymore. Destiny Islands had become a true home to her, especially since she longer counted among the Shinigami.
A city of darkness and slums lorded over by the almighty castle of the Death Gods, Soul Kingdom was what awaited those whose hearts weren't taken by the Heartless.
The Heartless resided on a different plane of existence- a dark, empty place where there was no day or night, only darkness and a purple haze. No one but those taken by the Heartless could travel there.
Not even the mighty Shinigami had been to that realm.
"Sora." He felt a hand on his shoulder. It was Riku, one of the Vice-Captain Shinigamis. The two had become close friends since Sora's ascension into the ranks of the Soul Kingdom. "It's gonna be dark soon. We should head back to the Islands with Kairi. Whatever we came to get today, it's too late tonight. We'll figure it out tomorrow." Sora frowned. What had he come to Soul Kingdom for that day anyway? Wait! He had needed to talk to Mickey, another of the Vice-Captains. But Riku was right- Mickey's shift wasn't until the morning anyway. He turned, looked up at Riku.
"I'd almost forgotten why I came, I was so tired." He said embarassedly.
Riku laughed. "That's so like you!"
Sora pushed him. "Shut up, I could still beat you in a match."
The Shinigamis stared at each other.
Riku raised an eyebrow. "That I'd love to see, Keyboy."
Sora groaned. "Stop calling me that!"
"You wish!"
They both leapt back, Riku's hand already to his Zanpaku-to, Ansemaru. Sora whisked his blade from the air, Keyblade-Roxazaraki.
"Submit, Ansemaru!" Riku brought it down, changing it's shape to that of what almost seemed the hand of a fell demon as it struck rock, Riku ducking as the Keyblade whipped overhead. Launching himself into the sky, Riku's eyes darted for his opponent, widening as he was hit in the back with the hilt of Sora's Roxazaraki.
"There it is, I win." Sora landed, a big grin on his face.