Eddie the Mask is a rather secretive Bandit that appears in Paper Mario: The Thousand Year Door. He is part of the population of a small, re-inhabited part of the thousand-year-old town in Rogueport Sewers.
Goombella describes Eddie as a health nut, which, for some reason, makes him an expert on Stylish Moves (which he is well-educated on and leaves several hints about). Eddie himself also says that he's a sports fan.