If you haven't read through Ricardo's massive Super Paper Mario coverage, you should.

Especially this part (from Chapter 3)

You'll also pick up two new pixl homies, Thudley and Carrie.The Luminous Ricardo Torres

Yay!

Carrie is a floating platform that lets you move at a faster speed than running and float safely over spiky floors, of which there are many.The Effervescent Ricardo Torres

Huh...uh?