Bowser Jr.

[Rökkan]

uuhhh I was thinking of a few concepts to Bowser Jr., maybe he could use moves based on his older brothers. After all, some characters has moves based upon other characters (Zelda for instance) as a reference to the series.
For instance, one of Bowser Jr.'s attacks might be a magical projectile with swirling geometrical shapes (like those of Kamek and some of his brothers), but instead of waving a magical wand to attack, he could wave his paintbrush. Or even summon a bouncy ball like Lemmy.

I suggest that the Clown Car would be his Final Smash instead of his Up+B. He'd ride the Clown Car, throwing Big Steelies and explosive Mecha-Koopas. The Big Steelies would roll to one side, but you could bash the ball with your Clown Car to make it bounce to the other side. You can't throw Mecha-Koopas while a Big Steelie is still on stage. You have to wait until it drops down the stage or to fade out.