The fusion thing is inspired off of Dragon Ball Z.
Sora and Riku are at the final battle with Xehanort, "Riku, this is the only way we'll beat Xehanort, we have to exchange keyblades and stab ourselves, then our hearts and bodies will join together." Sora said, "Okay Sora, let's do it." Riku said as they exchange keyblades and try to stab themselves, "I'm not gonna let you two fuse!" Xehanort yelled as he attacked both of them, "Sora, Riku, we'll make sure he doesn't attack you guys." Kairi and Lea both said, Sora and Riku then stabbed themselves and their bodies joined together.
"I am Soraku! The fusion of Sora and Riku, and you will meet your destruction Xehanort!" Soraku yelled at Xehanort, "Don't get cocky boy." Xehanort said, two keyblades summoned, Way to the Dawn and Kingdom Key, Soraku then strikes Xehanort then freezes Soraku and he can't move, Aqua then frees Soraku so he can move again, "Thanks Aqua." Soraku says to Aqua. Soraku does an aerial combo on Xehanort. Xehanort strikes back by doing a ground combo, Soraku then powers up and uses the darkness as a weapon, "Can't beat me now bitch!" Soraku says loudly then does a Dark Aura, "You little bastards" Xehanort says and does a ground combo, "Say goodbye." Soraku wispers as he does a dual strike raid then a Dark Break. "Any last words?" Soraku asks Xehanort "I, will come back soon." Xehanort says before fading away. Soraku then defuses, "Sora, we defeated him for good." Riku says to Sora, "Yup, we did, now let's go back home." Sora replied, "Yeah" Riku said as they went into the gummi ship, "Hey Sora, wanna do that fusion again sometime" Riku asked Sora, "Uh, sure" Sora replies to Riku.
Well, I might make another chapter to this bad fanfic...