Ive been thinking about this for a while now. From playing KHDS for my 3rd time now. FYI I can't use proper grammar, or spell.
=====================
Between Roxas and Namine= High Potential Couple
=====================
When roxas first met her, you knew for sure he liked her(hell I liked her FOR him). Also imo, she saw more of Roxas than anyone else, telling his dumbass to use the Keyblade when jumped by nobody's. Freezing time to say hello. Inviting him to her crib. Not to mention, Roxas had more of a personality when he was in TT with his friends (Hayner Pence Ollette). So he actually knew himself he liked namine. The end AMV when you beat KH2 kinda puts the icing on the cake.
SPOILER ALERT
SPOILER ALERT
SPOILER ALERT
So when Sora saves everyone in the next big KH, not only will he not remember Xion, he will run after namine first, no doubt.
Note: Well to be honest he just might, he did have flashbacks of his true past with Axel so he might have a couple of Xion when he see's her.
END SPOILER ALERT
====================
Between Roxas and Xion(faveKHchar)- High Potential Siblings
====================
Now don't get me wrong, at the end of "days" I wanted Xion to be the one roxas would end up with and I hated namine for it, but after some careful thought I changed my mind. Xion and Roxas are similar in a lot of ways, and grew up together in the organization. (yeah they grew up! Roxas and Xion had like 1 year to live so its practically growing up together.)
So if we are talking about affection between these two, I would have to say it was more, brother and sister love, like Xion was looking out for roxas the whole time. Just listen how Axel and Xion talk about Roxas privately. Even though Xion was born after roxas, she for sure played the role of his older sister.I think that is all the love Xion has for him, it could be the other way with roxas but, he has namine for that now.
====================
Between Riku and Xion????= Mid Potential Couple
====================
To be completely honest, i saw more romance between Riku and Xion, I mean Riku could have killed her, and Xion could have fought him back.
IMO, i think he has the most connection with her, since he got her going on her quest for knowing who she really was, and this may be a wild shot in the barrel but I think Xion went back to Sora for Riku. would make sense with all that time they spend together on that island.
==== Original == Blondie === Darkie
==== Sora ===== Roxas === Vanitas
==== Kairi ====== Namine == Xion