What can you be on Super Mario Galaxy?

Answer 1

Bee Mario, who can fly for awhile, and stick to honey
Boo Mario, who can hover, and go through walls
Ice Mario, who can walk on water
Fire Mario, who c-- ah, blast it! You know what he can do.
Spring Mario, who can jump really high
Flying Mario, who can fly around the observatory to collect hidden 1-ups
And last but not least, Luigi, who jumps higher and runs faster.

But the dark side of it:
Bee Mario hates water
Boo Mario hates light
All ghosts fall in love with Boo Mario
Both Ice and Fire Mario are only temporarily
Spring Mario cant stop jumping
Flying Mario can only be used in the Gateway Galaxy and the Comet Observatory Luigi stops slower.