No,you can not.
no if you can get all this stars then you can play as luigi but not shadow Mario
You can but it doesn't matter if you play Super Mario galaxy 2 before Super Mario galaxy
yes it is impossible to play as shadow in Super Mario 63
No you can't play as Princess Daisy in Super Mario Galaxy, but you can play as Rosalina & Luigi.
You need a copy of Super Mario Galaxy 1. Play it for a while ,then Play Mario Kart then it will say you have a gift From Super Mario Galaxy. then it will say you can play as Rosalina.
No
No, but when Super Mario galaxy 2 comes out in 2010 you can.
well super Mario galaxy 1 doesnt have Yoshi and super Mario galaxy 2 does.super Mario galaxy 2 has an icon for rossalina when you get 240 stars. super Mario galaxy 2 has coment medals which you get in the gane in all the galaxys super Mario galxy 1 you can play as Mario and lugi but in order to play as lugi you have to get 120 stars as Mario and in super Mario galaxy 2 you can play as luigi after you beat tall trunk galaky.
Yes, You can play as Luigi in Super Mario Galaxy 1 & 2. In Super Mario Galaxy 1, however, you need to really want him. He'll only be playable after collecting 120 stars with Mario (Double what's needed to beat the game).
you don't
you can meet toads in super Mario galaxy. but you cant play as one.
No. it would be impossible for shadow Mario to be in every Mario game, because some Mario games came out before there was a shadow Mario, or even a luigi.