Hi! Well, the reason is simple, but it is not related to the game, I'm afraid XD Personally, I liked a lot of KH characters, and so did my girlfriend. We were roleplaying as Vexen and Roxas and... I don't know, I just felt they were great together. I used to hate Axel, so I didn'n understand why people loved Axel/Roxas so much. That's all, I think! ^_^