From the Super Mario Wiki
“No toilet paper here, amore! ♪
Fleep's powers let him flip the background. His name is even a pun on the word "flip", and his appearance is that of a retractable roll-up window shade, complete with a pull string. Fleep's ability to reverse a section of the screen at will can be used to phase hidden objects from one dimension into the one the player is currently in. Whenever a sparkling rift is seen, Fleep can check whatever is behind it. The ability to reveal hidden objects to the player is similar to Flurrie's powers in the previous Paper Mario game, Paper Mario: The Thousand-Year Door. His flipping ability can be used to stun enemies, confusing them into submission for a short while. This effect can also be used on projectile attacks, rendering them harmless. If used on a Mr. I, he can directly kill him, because he flips and gets confused.
When the player first meets Fleep, he is in an outhouse on Planet Blobule. The player must then retrieve him some paper so he can "clean up", and the three heroes eventually acquire the Ancient Clue paper from Blappy for this purpose. After Fleep comes out of the outhouse, he pledges himself to Mario's team. He likes to sing while on the toilet, and speaks with a Spanish/Spanglish accent.
Because Fleep's powers act only on the background, he is the only Pixl who cannot be used in 3D.
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