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Mr. Friend (usually called "Mr. Fiend" by the babies) is the name of a robotic toy made by Stu Pickles in an episode of Rugrats. He was designed to be the perfect playmate, but instead, it creeped out and scared the babies.

He can be found in the video-game Rugrats: Search For Reptar - however the toy has malfunctioned and instead of being a plaything it has become a kind of mini-boss that spawns multiple versions of itself while attempting to actually harm Tommy while spouting out strange songs and rhymes: Tommy uses small cans to knock the robots over and destroy them but if they touch him they cause him to take damage.