I really don't see how people can see RokuNami, really :\ I didn't see it in KH2, and then Days came out and confirmed what I've been saying since forever - Namine only sees Roxas as a tool to get her Sora back. Even if she saw Roxas as something more than something she needs to get out of the way, it would be as a part of Sora but that's leading back to SoNami and not proper RokuNami.
And then there's the infamous SoKai/RokuNami scene but seeing everything those two have been through it's... disgusting to me, really. They don't even know each other but they don't want to disappear (talk about OOC. Their entire development was their coming to terms with disappearing, and Namine believed strongly the sooner, the better), so they latch onto each other. By keeping the other alive inside their Somebody, there's someone there to keep them alive back inside the other Somebody.
Not the best basis for romance if you're aiming at a healthy relationship.