Keyblade Glider. I really thought that fighting with it was even more fun than the gummi ship in both KH and KHII. Even though it can be a little tricky at times...
Ours isn't plain, but it isn't full of decorations and lights either... And i wouldn't say it's decorated nicely, either... it's fat on the bottom and super skinny at the top. It looks like something out of a Dr. Seuss book!
It depends on how well I'm doing in the game... and sometimes whether or not my sister played it last. I can get very competitive when it comes to her.