Either... Leaf, from Return to Dreamland, or... Magic! :D From that one GBA game I forgot...
Magic came from two different games if I remember correctly. Amazing Mirror (or was it Nightmare in Dream Land?) has it in the one-time use form, while the Magic you see in Kirby Squeak Squad/Mouse Attack is an extended version which grants it actual attacks, some of which have properties like Hammer!
As for my take on the abilities, my favourites would have to be Super Star/Ultra's Yoyo, Adventure Wii's version of the Hammer (gotta love that Hammer Twirl) and Smash of Amazing Mirror.
Fighter and Sword are my favorites.
Hammer (Though I am fast enough with Ike's Reflect move :P)
My Top 3 Favorites:
1. Ice (Because of Glaceon's Type :P)
2. Mike (Your terrible at singing kirby! :).)
3. Paint (Paint me something!)
My favorites are unique because they spell IMP