Eddy the Mask
From the Super Mario Wiki
Eddy the Mask (erroneously called Eddie the Mask in Goombella's tattle) 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. Eddy the Mask's name may be based off of Eddie the Head, the mascot of British heavy metal band Iron Maiden.
Goombella describes Eddy 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). Eddy himself also says that he's a sports fan.
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