Kind of in the middle. The thing about Kingdom Hearts to me is that you keep mashing ⓧ to murder Disney!creatures of grimm with your giant key. Sora Naegino would fit in fine, but she might have trouble wearing so many zippers. The problem with Kingdom Hearts is that the plot is kind of incomprehensible, so I'm not really sure that any crossover with it should be. It's fun enough to play and all but I'm too lost to figure out what kind of crossovers are even possible.
"Kitto daijoubu da yo." - Sakura Kinomoto