The relationship of these characters is really unclear to me really and the thing is that I can't imagine what it would be like when they meet again in KH3 (which I believe they will). Many KH characters are clearly friends but I can't say a thing about Roxas and Namine. For me it's like they just met and they got along and all, but without the end of KH2, I wouldn't even call them friends.

 

And then there is the end of KH2 with their conversations and Namine for example saying that "We can be together again!". And for me it just does not make sense that they'd be THAT happy about it, they just met!

 

So what I'd quess is that Roxas and Namine are supposed to have some sort of romantical feelings for each other because they're Sora's and Kairi's nobodies, even though for me it's  not a big enough reason and I don't really like them as a couple.

 

So when I think of KH3 and really try to see how they'll act, I kind of see them having a romantical moment or something, becoming some kind of couple, or a hinted couple.. But I wouldn't want to see that and it wouldn't even make sense to me but still I kind of have a feeling that the game makers want it that way : O

 

But I'd want to hear how you see their relationship and what you believe will happen between them in KH3, since I really don't know

I do believe Roxas and Naminé are gonna become the Next Couple Nomura will want, Because in Kingdom Hearts 3 There were a lot of hints throughout Kingdom Hearts 2 and Dream Drop Distance There is proof to support this. Roxas is constantly thinking of her, While Sora was receiving those memories Naminé was in 2 prominent memories among those bubbles. So If Roxas considers Naminé important, He has to like her and Look on the bright side When they're in a Relationship in the future They could get to know each other better which would lead to them loving one another more. 

Also, I think Nomura officially made Roxas and Naminé Canon because of the implications in KH3 When Sora was talking to Naminé in The Final World.

On 7/15/2013 at 9:21 PM, Reyn said:

I think they could be a couple.

I agree, In fact in Kingdom Hearts 3 Naminé and Roxas are separated which caused them to miss Each Other. I mean, If It weren't for DIZ and Ansem-Riku kidnapping Naminé to prevent her from talking with him Roxas would have never destroyed the simulating computers in the first place. Like in Final World, Naminé appears as a Star and When Sora talks with her mentions Roxas missing her She giggles almost as if she's blushing. At the End of KH3, Roxas is behind Naminé on Destiny Islands and talking with Terra about her Probably In Dream Drop Distance Naminé is in Two of Roxas's Memory Bubbles when transferring his memories to Sora while Reconnecting with him Which means She must really be important to him.