It's an opinion that shows you haven't played a DKC game.
K. Rool is able to toss his crown like a boomerang and cause cannonballs to rain from the sky in DKC1, use a blunderbuss that shoots cannonballs, spiked cannonballs, puffs of smoke that do different effects (purple reverses controls, for example), and barrels, sucks up things, and jets across the screen with, as well as turn invisible in DKC2, use a helicopter pack and convieniently placed electical fields in DKC3, as well as boxing skills, shockwaves, throw boxing gloves like a boomerang, and turn invisible (again) in DK64.
In my opinion, a move that represents each would be nice.
For example B and Side B could be the Krown Toss and Blunderbuss Shot, Up B could be the Kopter Pak, and Down B could be the Krushing Shockwave.
Final Smash can reference a recent game, Jungle Climber, as K. Rool eats the Crystal Banana and grows huge, while you control him similar to controlling Ippatsuman's mech in Tatsunoko vs. Capcom.