Fan Theories About Kingdom Hearts That'll Change How You See The Franchise

There is a "Disney Theory" beyond the universe of Kingdom Hearts that seeks to prove all the Disney movies exist in the same universe. Well, one observant gamer points to a line from the Kingdom Hearts universe that essentially claims the Disney Theory is true, which extends to the universe of the game. "In Kingdom Hearts: Birth By Sleep, Kairi’s grandmother tells her a story of a time where all the worlds were connected in light. Darkness crept in when people began to fight over the light, and that is how the worlds became separated."

Pretty simple. Whether it's true or not, one can't argue the existence of said claim within Kingdom Hearts itself. The theory is pretty elaborate (if you care to read it), discussing light and dark balancing each other in the universe, but it all comes down to grandma's claim.

Redditor /u/PresWelke's theory that Sora is the one King in the world of Kingdom Hearts is based on some pretty sound, if not straightforward, reasoning. "The symbol representing Kingdom Hearts itself is the crown on the Kingdom Key and Sora's necklace. Thus leading to the belief that Sora is the rightful king (hence why the symbol is in the shape of a crown)." 

That alone may not be convincing, but this Redditor goes on to point out a couple more design elements in the series that give further proof. One is "the [Kingdom Hearts I.5] cover art" which "not only features Sora sitting on a throne of Keyblades, but he is wearing the very same crown that represents Kingdom Hearts." Then there's the χ-Blade, which is known to be comprised of two Kingdom Keys, one of which is indeed Sora's Keyblade.

Everyone is just dying to know what was in the box the Master of Masters gave to Luxu before the events of Kingdom Hearts χ. Well, Redditor /u/keyblade_crafter has an idea:

What if the Master is keeping his heartless in the box and he's a nobody! The reason he acts so strange/silly could be because he's faking having a heart. It could be why he has a special power to see the future, and definitely why Luxu would be so surprised to hear what's in the box. And after the Master fades, if his heartless were to be destroyed, he would be reborn.

What exactly is going on with Terra and Lingering Will? Redditor  /u/Anivia_Blackfrost actually has a pretty good idea, even if the theory is presented with a fair amount of trepidation:

Towards the end of BBS, Terra-Xehanort gets a bit of a jumpscare when the Lingering Will emerges and proceeds to engage him one-on-one. He exclaims: "Your body succumbs, your heart submits, so why does your mind resist?"

This got me thinking. Could Xehanort's time-travel foolery in KHDDD have given Terra a chance at reviving himself? We have his heart and his body, AnsemSoD and Xemnas respectively. Maybe now we'll just need his will to round them all together?

This could also be a great excuse for a normal Terra and a normal Xehanort to meet face-to-face once more in KH3.

While it's established that the Master of Masters's no name Keyblade gives him some power of prescience, Redditor /u/cbijeaux thinks there's more to the story. The theory posits that the box the MoM gave to Luxu and instructed to never open contained the Book of Prophecies.

As it was passed down from Master to Master, Xehanort finally broke the rules and opened the box, explaining why Xehanort seems to be nearly omniscient. This Redditor believes the Master of Masters intended for this to happen, waiting for a disciple willing to break the rules and open the box, eventually allowing him to see Kingdom Hearts.

Redditor /u/TheRyanSpark's theory actually comes in the comments of a far less well-argued theory that (kind of) reached the same conclusion: Riku will get the Kingdom Key D. This Redditor bases his theory on what we know of Riku and Mickey as established throughout the series, explaining how Riku will complete his redemption after the Kingdom Key sort of shunned him for Sora:

Now Kingdom Key D is the counterpart to the Kingdom Key. Mickey manages to find it in Destiny Islands. But before he has Kingdom Key D, we know Mickey's Keyblade was Star Seeker. A detail I think to note here, is that in Dream Drop Distance, Mickey actually calls upon Star Seeker when Maleficent invades Disney Castle. He could easily have called on Kingdom Key D, but he summons his old Keyblade. This could mean Mickey has the choice between the two.

If we put that together with the fact Riku was originally supposed to use the Kingdom Key, I can confidently say Riku should be given the Kingdom Key D by Mickey. Mickey already can use two Keyblades, and if Riku hasn't got one, as the good fella Mickey is, he'll lend his friend a hand. Riku has also shown to be the character who has passed through the darkness, and seen it through enough to conquer it. What better sign to show Riku has no vulnerability to the darkness in the present than having him possess the Kingdom Key D, the dark counterpart to Kingdom Key. It would be the end of his redemption, finally possessing the Keyblade that was meant to be his, but its dark counter part, to show that he has overcome the darkness in his journey and can now wield it without worrying about being tempted.