I think both Xion and Namine fall under "girl next door" types. It's just that Namine's the "hermit" variation of it while Xion's livelier.
I think it was pretty forced in CoM too, if only because of the setting. They were all pretty trapped in there with each other. Though about the most forced thing I found in Days was how Roxas was obsessed with Xion. In CoM it made sense since 1) Sora was forgetting anything but her, making him believe he cared that much more, 2) the immediate, present danger. Roxas just... didn't care about anything anymore and just because. So much for trying to establish AkuRoku friendship. But as I keep saying, I'd much sooner blame that on how they wrote Roxas than introducing Xion. I do believe one led to the other, but Xion's not to blame, to me. Rather, I step back and look the Organization over. Sorry, PLOT wise? They fail at being worthy of their own game. Even the novels never introduced actual plot for them to play out as far as I know, being more expansions on things we've already bothered with, character insight or random stuff that don't matter (with all due respect to Axel and Roxas being responsible for Maleficent's ressurection going by the novels... does that even really matter? sure it would've been nicer to have instead of like ten ice cream chats, but it doesn't make a difference.
And tell me about it. What gets me the most is people that say Xion's ugly while they think Kairi and/or Namine are pretty. That's just messed up. Even when I say I don't like KH2 Kairi's looks I can actually blame the haircut rather than her face since I find that attractive.
In most stories, the character WILL be a plot device, though. Sora's kind of an odd case, being relatively a plot-less character. Even in KH1 he was chasing Riku, not so much doing things on his own. Sure he had the Keyblade as a plot device but Riku didn't need the Keyblade to do everything he's done. So Xion and Kairi having PLOT to them makes them a lot mainer than most boys. It's just that Xion's actually developed as a character, making her a true Main compared to Kairi who seems to stay as a mere plot device.
And as for Namine... I dare say that's part of why fans should've raged more. I realize Axel said in KH2 that Roxas was the only one he liked but between this and hate on Xion being introduced there's a way to go, me thinks. Whereas suddenly, there's another girl who was friends with Sora and Riku. And she seems to have been their childhood sweetheart, to boot, and both love her dearly. If that is not the textbook definition of a Mary Sue self insertion, I don't know what is (well, one of the definitions, at least). I think people hate on her less because she's easier to write off, BECAUSE of the fakeness of the Memories and the whole "I replaced Kairi" shiz, even though the strongest SoNami Memory, the Promise Memory, if it's not a completely new Memory it's one she replaced RIKU in. What the fuck, fandom. Whereas with Xion, even if she was forgotten, that doesn't make what she had with Axel and Roxas any less real.
Also, the fandom as a whole seems to like Sora a lot less than he does Roxas. So Namine being introduced next to Sora didn't irk people as much as Xion being introduced next to Axel and Roxas.
What also gets me is that Roxas and Axel didn't really have a past, not as much an established one like Riku and Sora in that sense. Namine was too random and "epic" a story element in what should've been a normal childhood, but Xion being introduced into the Organization? Aside from going by the novels I fail to see why it should be really all that hard to accept. It's been a year; I should hope the Org was doing SOMETHING Worthwhile and hey, guess what - Days being an in-between game is kind of also the reason why the Org COULDN'T. Since doing too epic stuff would contradict KH2 too. So they had to find another way to get around it.
Hi Xion.
tl;dr I still blame a lot of anti-Xion on falsely based expectations. I also blame a lot of this on the novels even existing, though the more novel-bits I read the more of it I see in Days so what the deuce. Ok you say Riku's OOC for caressing Xion's face? Then I guess he was pretty damn OOC in the novels you like so much, too, when he did the same for KAIRI AND NAMINE (KH1 and KH2 novels, respectively). Difference is, like you said - with Xion it's harder to ignore since it's cold, undeniable canon.
I remember the scene, just not its placement. And I still don't see how it contradicts anything, beyond AtW being all remoresful and talking about a time he was a complete bitch at.
That depends. Deciding to bring Roxas in could leave him in a position similar to what he's been with Xion. While a bit more urgent, he could've still tried to reason with Roxas. But Xion showed him why he couldn't.
I pull puppet jokes too from time to time xD; it's just who and what Xion is. No denying it.