(no subject)
First of all...
The honorific -chan is an intimate honorific and I highly doubt that any guy would immediately refer to a girl as -chan and have the girl comfortable with it right away, without even knowing his name. Especially Xaldin. I doubt Xaldin would use -chan on Namine right away or even at all. Honestly. Your writing isn't even that bad; stop making it look that way by using unecessary honorifics. The honorific -sama is used for higher-ups (like royalty or gods), not just for people you admire (did I get that right?).
Second of all, and to someone completely different...
Just because you don't like the characterizations portrayed in the game doesn't give you the right to completely BUTCHER them from the inside out. If you want to write someone being girly and nice, write Selphie or Kairi, not Larxene. If you want to write someone who's talkative, write Seifer, Hayner or Zexion, not Fuu. And Naminé can be strong without knowing karate or wielding some super-pwnsome broadsword. Plus, Larxene isn't a tomboy. She's not primpy or girly, but I don't think she's a tomboy either. And she wouldn't be afraid of Demyx even if he suddenly went through character bastardization and became violent and suicidal. She'd beat the shit out of him if he tried to do anything to her but we are talking about your characters, of course.
It's one thing to think someone acts likes such-and-such because of how you perceived their characterizations in the game. It's another thing to twist it around just because you didn't like it.
Aaaand no, the Demyx/Larxene M stories aren't gonna go away, even if they don't use Emo!Demyx and Nice!Larxene.
Wait, wait, wait-you renamed Fuu to Kana? What's wrong with the name "Fuu"?
Jeez.