I know this is kinda late, but I just stumbled across your thread or whatever. Here's what I think:
KEY: A - Attack , B - SpecialSide A - Bee Mario sings the opponent.
Down A - Ghost Mario(don't really know if it's Mario, but here's a picture:
http://static.gamesradar.com/images/mb/GamesRadar/us/Games/S/Super%20Mario%20Galaxy%202/Everything%20Else/A-Z%20of%20Super%20Mario%20Galaxy/WII49.pre_galaxy.art_boo--article_image.jpg) Something like MetaKnight"s Down B. Mario disappears leaving some dust behind, and re-appears to hit the opponent below him. This in controllable, just like MetaKnight's.
Neutral A - Mario attacks like his regular SSBB attack, but when his attack meets his opponent, some star dust shows(like the dust you have with you when you have the StarMan or something named that), and affects the opponent by giving them the flower effect(the flower that makes you gain damage when it is on your head, I think it's called "LipStick").
Up A - Ice Mario does a uppercut(on the ground) and gives the opponents the freeze/Freezie effect(when you get hit with a mini-glacier{Freezie} and then a glacier captures your opponent in it).
Well, what do you think? These are from Super Mario Galaxy 1 and 2. Please keep these in mind even though I'm replying late! Thanks!