Niff T. is a character that appears in Paper Mario: The Thousand-Year Door.
Niff T. is a local business man that run's Niff T.'s Shop in Petalburg. His shop is the second shop that you encounter in the game. He looks exactly like Thriff T. and similar Plenn T. because he and Thriff T. share the same sprite and Plenn T.'s sprite is basically the same with one small difference in the mustache.
- His name is a pun of the word "nifty."