Fuzzy Slippers is Gerald's mysterious informant, and source of many local myths and urban legends. He is never seen and his true identity is never revealed, if he exists at all.
Fuzzy Slippers was first mentioned in "Door #16" when Gerald claims that Fuzzy Slippers wears bowler derby hats, and purchases his from Toller's Bowlers. He is then mentioned in "Cool Jerk" when Gerald claims that Fuzzy Slippers had informed him that Frankie G. was "bad news." And in Hey Arnold! The Movie, Fuzzy Slippers gives Gerald the address to Bridget's base.