Rosalina moveset:
B: Star piece: She throws out one of thse star peices. They can be aimed, and do not disappear like Fox's blaster, but they moves slowly like something would in space They do break when they are hit though.
^B: Zero Gravity: Her third jump allows her to hover, but unlike peach she hovers for a shorter time, and can move 360 degrees. Her A moves can be used in this state, but not her B moves.
vB: Star trap: You know those things in Mario galaxy that act like cannons and blast you places? Well using this move will cause one of these to pop up. on the ground they are at an angle, so they will shoot the opponent, causing them to fly through the air in a "rainbow" type of pattern. If used in the air, the cannon will shoot them towards the ground.
B>: Luma dash: Rosalina flicks her wand and Luma dashes forward a few feet, and swiftly returns to her side. Think ZSS's B>, but slightly higher in the air, (unless she is ducking) and a Luma!
Bowser Junior
B Fireball: It’s well known that the lad can’t exactly breathe fire yet like his daddy, but he still can bring a little bit of spice. His fireballs would move slowly, in a straight line across the level. You can cancel one by spitting another, and upon canceling the first, it will explode slightly. So anyone, say, jumping over it or getting too close will get a minor burn, and do that stupid flinch animation every character does when Bowser uses fire breath on them.
BV Shield Bob-Omb: Junior can sit bomb down, where it will take about three seconds to explode, or, hold down B, and then angle straight up, rainbow the bomb to the left, or rainbow the bomb to the right. Upon contact with anything the bomb will explode. The bombs are going to be similar to Link in explosion style, and look visualy larger/different to the bob-omb item.
B^ Clown Car: Pretty simple. Pressing up B will make Junior appear in his clown car, where you have complete 360 control for about three seconds.
B> Paintbrush: Junior lunges forward jabbing the opponent with the paintbrush. Simply tapping B> will make the move stronger, but if you hold B down, Junior will wiggle the painbrush around, leaving slippery paint on the ground, which can cause you to trip if you run into it. Only one paint slick, bomb, and fireball are allowed on the field at a time.
I just think Rosalina sounds 100% more fun.