When attacking an airborne enemy, Sora will spin into the air powerfully striking them If you're curious just read through the descriptions and optimize how you want to. Many of the other characters from the different worlds have several unique abilities but the game tends to auto-equip the best ones so they aren't worth mentioning in this post.
Goofy learns a few unique offensive and support abilities, check them out under Donald's Abilities & Goofy's Abilities. Being the magician, Donald doesn't learn any unique abilities as his strength lies in your ability to learn stronger magic.
Sora learns a large number of different abilities and Donald & Goofy will learn far less, but helpful ones. Over the course of the game there are several different abilities that will be learned.
