King K. Rool
Kaptain K. Rool
Baron K. Roolenstein
King Krusha K. Rool
All are the same person. All add a variety of moveset potential for what many see as the next priority to be added to a smash game. K. Rool is really up there in the top tier of who should be present in the next Smash Brothers game. Just to show the vast amount of possibilities that K. Rool could use in his moveset:
Donkey Kong Country: In the original game, K. Rool wore a crown and a cape and called himself "King K. Rool". In the final boss encounter, he could roll his crown along the ground as a projectile attack, do a barreling charge attack, and leap up in the air to fall down and crush enemies. This leaping could also cause cannonballs to fall from the ceilling.
Donkey Kong Country 2, Diddy's Kong Quest: In the sequel to DKC, K. Rool returns again. This time he is at home field on Crocodile Isle, and he has a new plethora of moves and a new name for himself. As "Kaptain K. Rool", he is able to use his high-tech hand cannon to shoot cannonballs and barrels that can go straight, bounce, or even twirl through the air! He can also use this cannon to shoot out mysterious puffs of smoke that inflict strange effects upon you based on their colour. These include freezing you in place and disorienting you by reversing your controls. This cannon can also suck in objects and shoot out flames that can be used to boost K. Rool across the stage.
Donkey Kong Country 3, Dixie's Double Trouble: The game that completed the original trilogy appeared not to have brought back the notorious K. Rool. However, in the end in turned out he had been hiding in an invention he had made: A giant metal robotic suit called K.A.O.S.
After breaking the suit, K. Rool comes out as "Baron K. Roolenstein". It seems K.A.O.S. isn't his only new invention, either. He has also made a jetpack-like device that uses a helicopter rotor to allow him to fly around.
Donkey Kong 64: In the first 3D Donkey Kong game, K. Rool returns yet again. This time he is the great boxer, "King Krusha K. Rool". This quirky boss fight has you fighting him as he throws punches at the various Kongs (and you take a strange trip inside of him as Tiny).
Other: There are other aspects of the Donkey Kong Country games where K. Rool originated that have yet to be integrated into smash. K. Rool could gain the ability to do anything from summoning his Kremling minions, to riding in a minecart, to blasting out of a barrel!
K. Rool has the best moveset potential for a character out of almost anyone, including those already included in the game! There are literally no reasons why he doesn't
deserve a spot, and the only reason he wouldn't are no fault of his own.