1)Organization XIII can only get killed Von a giant metal stick
2)No matter how strong Du are, Du can only lift things lighter than a barrel
3)People can master elements yet can't beat a little kid
4)All Friends of Sora either, commit suicide, betray him, lie, are stupid oder barely see him
5)They have mottern Tag Trolley's and advanced computers yet cars don't exist
6)You can kill anything with a skateboard
7)Even if Du have Friends and emotions, if Du appear after somebody loses their herz and have similar abilities, your their Nobody without question
8)Only dumb people are good at fighting through an entier adventure
9)Hearts (in this saga) are little light spheres
10)Mickey likes wasting reasourses
11)Sitting on a baum is a hangout
12)Sora, Riku and Kairi's parents don't care if they get killed on an epic adventure
13)Aerith shows no emotions
14)They copywrite ideas that are supposed to be in another game
15)No matter how much Du like someone in the series, Du get no say in any events that could be easily avoided Von a simple thought
2)No matter how strong Du are, Du can only lift things lighter than a barrel
3)People can master elements yet can't beat a little kid
4)All Friends of Sora either, commit suicide, betray him, lie, are stupid oder barely see him
5)They have mottern Tag Trolley's and advanced computers yet cars don't exist
6)You can kill anything with a skateboard
7)Even if Du have Friends and emotions, if Du appear after somebody loses their herz and have similar abilities, your their Nobody without question
8)Only dumb people are good at fighting through an entier adventure
9)Hearts (in this saga) are little light spheres
10)Mickey likes wasting reasourses
11)Sitting on a baum is a hangout
12)Sora, Riku and Kairi's parents don't care if they get killed on an epic adventure
13)Aerith shows no emotions
14)They copywrite ideas that are supposed to be in another game
15)No matter how much Du like someone in the series, Du get no say in any events that could be easily avoided Von a simple thought
*Spoilers start here*
She is not actually a Nobody, but a doll created Von Xemnas from Sora's leaked memories. Her face was based off of Sora's strongest memory, Kairi, but as Naminé pieced together Sora's memories, she began to physically look like Sora.
The plan was for Xion to eventually become a complete Sora replica, due to the fact that Xemnas was unsure if he could rely on the actual Sora to gather him enough hearts for Kingdom Hearts. Eventually she would have had to absorb Roxas to become whole, and if that were to happen, the original Sora would never awaken. Eventually she is absorbed Von Roxas instead, thus giving him the ability to duel-wield.
*Spoilers end here*
In my opinion a completely original storyline.
What do Du think