His death wasn't funny. It was excruciatingly painful to hear him scream like that. Not, in, like, the emotional way in that I was upset that he died, but in that it actually hurt my ears.
His, 'silence, traitor', line is what gives me hope that there is more to Demyx than what meets the eye. Sora underestimated him, and that's what always made me think that Demyx wanted it that way.
Demyx might not like to fight, but that doesn't mean he isn't stupid. Playing weak to get Sora to underestimate him, and therefore become cocky, would be just the type of thing someone with sly cunning would think to do, if it meant getting rid of him.
I agreed that Demyx isn't stupid the way a lot of people like to portray him in fanfiction (he's got to be one of the most abused characters in the KH fandom!) but I also don't think he was attempting to fake-out Sora by acting friendly and laid-back. We have the scene when Sora first encounters him in the Underworld: he's
already running for his life before Sora gets there, and he just keeps on running while barely acknowleding the group except to tell them to get the heck outta there! It isn't until later that he realizes that Sora is the guy that he's supposed to be looking for, and even then, he's really not eager to fight him until their last encounter.
The novels and short stories do give him more depth (and make me excited to see him in Days). He does have the guts to tell Xaldin to get the heck out of his room when he's playing his sitar, and he sort of angsts while playing it because he can't get it to sound the way he wants to without emotions. We also find out that he's a little OC about his hair; it has to be arranged a certain way because he thinks that's how it looked when he was human. As far as his reaction to the events of KH2, he actually protests, however feebly, about eliminating Roxas. After the events of the prologue, he still insists on calling "the hero" Roxas, and doesn't like that he's been ordered to tail Sora/Roxas in the Olympic Coliseum. He also seems to be friends with Xigbar.
Idk, I get the impression that Demyx is pretty kind-hearted for a Nobody, but everybody has their limits, and when Sora tells him he has no heart, that was the straw that broke the camel's back. It makes me wonder if that was the moment when he realized what Axel had known since the end of prologue, that "the Roxas I know is long gone," and that's what made him snap and say, "Silence, traitor!"
