Disclaimer: I do not own Kingdom Hearts, Lilo and Stitch, Pokemon, and any other material that I use. I'll make the disclamier when I introduce the new world.
The road so far...
18 year old Matt was just an ordinary guy from what he thought was reality. One day after he is attacked by strange enemies, he meets Stitch and Pikachu, who take him to Disney Castle. Matt meets King Mickey and Neo from The Matrix. There, he learns he is a chosen wielder of the Keyblade and his destiny is to fight the Heartless. It looks like Sora's, it's color is more blue. Matt is proven worthy when he saves Stitch and Pikachu from Xavier, Matt's 'rival'.
Unfortunatley, there is a new Organization led by a strange leader, one who can bring back Sora, Kairi, and Riku have gone missing. Worst of all, Matt's 'friend' Laura is abducted by the Organization. With Stitch and Pikachu at his side, Matt decides to venture to the worlds and search for Sora and Laura.
While in Radiant Garden, Matt, Stitch, and Pikachu find Donald and Goofy. A powerful spell put on the two makes them forgetful of what happened. Also, a figure dressed in Organization clothing leaves behind a letter stating he is helping them.
Matt, Stitch, and Pikachu begin their journey...
Worlds completed:
The Matrix, Disney Castle, and Radiant Garden.