Yes, I agree, Kit_Lee. Kit would probably wish for peace...and maybe a plane of his own. And Baloo would definitely want food and lots of it.
As for the others:
Rebecca: A few thousand shaboozies in the bank - make that a few million shaboozies - happy times with the Higher for Hire 'family' and snow.
Molly: Toys and candy. Hey, she's six.
Wildcat: He seems like he wouldn't want much. Tools and perhaps a new pet. Or maybe some jellybeans and eggs to make jellybean omelets.
Shere Khan: The world.
Don Karnage: The world.
Col. Spigot: To be so famous that everyone in the world knows his name. Going along with that - a giant statue commemorating his colossal feats in the Glorious People's Museum.
Sgt. Dunder: Hot dogs and a chance to meet Broadcast Sally.
Louie: A couple of bodacious babes, one for each arm.
Trader Moe: A sackful of clam shells and two new goons.
And that's all I can think of for now.