Roxas = didn't remember his original self. Still named after Sora.
Naminé = 1) born from two people, name's meaning representing as such.
2) Not an Org member, so who really cares.
And don't try using Xion as reasoning, seeing how
1) We don't know what's up with her yet
2) Roxas still stands as contradiction and we do yes know about him.
Even though he didn't, Xemnas did.
Never intended to use Namine to support myself.
Also I can't really say this is completely true or false since there's not enough evidence, but I do feel that there's at least a chance this can be true. I seriously doubt this (among many other things) are as black and white as people think. Nomura wants us to think and have theories, but as KH2 showed, a good majority of them won't be right.
And I might have used Xion to support myself, not sure. From what I've noticed, she doesn't even know who she is, which can explain her name. Or not, who knows. I just doubt her name is Oni or something deriving from those letters, but it also is possible she's another special case. No one can really confirm or deny this until the game comes out or until more information is released.
Gameplay graphics, har.
And personally, I'd kind of like to see some solid proof about Nobodies aging or not. I really can't remember anything clear-cut about it :\
I'm just trying to wonder exactly who thought this random thing up and why. I haven't seen it in any Ansem reports nor was it ever stated in an interview. And whenever the only proof that Nobodies do age show up (Namine), they dismiss it as her being "special"? That doesn't make any sense. Either way, the Roxas thing I came up with is something to think about at least, since there doesn't seem to be any proof anywhere of Nobodies not aging.