The antagonist of your KH4 story I presume.

I'm assuming the keyblade wielding girl who resembled Kairi is Sora and Kairi's daughter. Ying was it?

So, Terra is Hiccup's uncle? Interesting.

I hate to be a point out grammar but:
-"Then [will] you doing here?"- Did you mean 'what were'?
-"...but they nearly died because I [can] kill a dragon..." I think you meant to say 'wouldn't'. This one's a major error.

He's like Xehanort...a heart filled with darkness...he's one of the thirteen hearts of darkness isnt he?

Oh joy...now Voldimort is involved in this... and I think I can answer the question as to why Xehanort did not turn Voldimort into one of his seekers.