Demyx
Sloth
The sad thing about Demyx was just that he was lazy. The Organization couldn't send him out on any mission that involved combat, because he wouldn't even attempt to get it done. He would just sit on a building in Twilight Town and play his sitar.
Demyx really couldn't help it. He was just naturally lazy like that, nothing more to it. So what? What was really wrong about wanting to relax and be comfortable? Apparently too much. That was why Saix was nagging at him so much, because he would never even attempt to get his work done unless it was just recon. Recon he could do, because he also like to look at things. He liked to explore, and it wouldn't be so bad if it didn't mean fighting all the darn time.
Being a sloth, or just plain lazy, though, was what killed Demyx in the end. He hadn't really been ready for that battle with the Keyblade Master, even though he had fought him once. He just thought it would be more lax…
I was going to use Sora for this, but I kinda used him for the first chapter, if you count him along with Vanitas. Oh well.
Omega Star Shooter 14 : That's right~! XD
XXXHikari-KuraiXXX : I would too. :( Sora kinda did ruin Roxas's life. Along with Riku and Namine. Not that I'm blaming them or anything.
Buddahbb : That's what I think too. Xion would be next after him. Then I think Riku would. Or Axel.