[Gearz]

Yeah, felt like making one of these just for the hell of it. I made the list for the VGForumers that have not purchased the game yet.
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WARNING! MINOR GALAXY SPOILERS!

• Bee Mario
  Gameplay Video: YouTube - E3 2007: Super Mario Galaxy Bee Mario
• Boo Mario
  Gameplay Video: YouTube - New video of Boo Mario in Super Mario Galaxy
• Fire Mario
  Gameplay Video: YouTube - Super Mario Galaxy: Fire Mario Gameplay
• Ice Mario
  Gameplay Video: YouTube - Super Mario Galaxy Ice Mario Gameplay
• Spring Mario
  Gameplay Video: YouTube - Super Mario Galaxy Spring Mario gameplay
• Flying Mario (Only used in Observatory)
  Gameplay Video: YouTube - Super Mario Galaxy - Red Star Mario transformation

Edit: Duh, forgot the question ._.

Which one do you think is the worse?