SMASH: K. Rool

Since I try to always have a hero and a villain from each represented franchise, it should come as no surprise to see Donkey Kong's arch-nemesis making the rounds.
I originally wanted him to appear under the guise of Kaptain K. Rool so that I could make use of his rather versatile blunderbuss, then I realised that he always appears as the King now, and since Lucas is able to use almost none of his own attacks then I could just give him the damn gun anyway.
I also decided to add a bit of flair with his collar from that baseball game, but drew the line at the loin cloth.

Kannonball: A simple attack wherein a large metal ball is fired from the blunderbuss. Maybe it explodes or disappears after a certain distance? Maybe it's occasionally spiked or a barrel? Maybe it sometimes backfires? All possibilities.
Krown Toss: I didn't want to use this one but since it's the first attack he ever exhibited it's got a pretty good chance of inclusion. As the crown rolls along the ground it can hit multiple times, unlike the Kannonball which would be one solid strike.
Flying Krock: In DKC2 K. Rool shoots flames out of his gun to jet across the ground, so it only makes sense that this same concept can be applied vertically.
King Krusha: Not my first idea for this move, but it overlapped with somebody else so I changed it to this. A powerful but very close range move. Perhaps reminiscent of the Koopa Claw/Wario's Chomp wherein it might clamp down on a foe and allow you to damage them repeatedly.
Kleever: Quite a lot of these moves were difficult to think up. Most of K. Rool's actual attacks are quite derivative so maybe Nintendo can be more imaginative than me. This attack works similarly to Link's Triforce Slash, but since Kleever is sentient he is able to hack away at the enemy while K. Rool is free to carry on fighting. To compensate Kleever's barrage would probably not be as powerful, or might not have as much knockback when complete.