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Ruffman8890, or RM for short, is a blooper maker and a friend of SuperMarioGlitchy4. He first appeared in the video "Awkward Weddings", in which Rocks accidentally spawned him while trying to create a love potion. He later appeared in several other episodes.
Ruffman8890's color code somewhat resembles MarioMario54321's and mostly Skelux's because of the three colours orange, white and blue.