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Barney is a purple dinosaur murderer that has his own show called Barney and Friends by PBS Kids and HIT Entertainment.
In SMG4's universe, however, he made his first and cameo appearance in Guards N' Retards: Prisoners. He also had a cameos in R64: Freddy's spaghettiria, Return to Freddy's Spaghetteria, Super Cavemen Bros, and SMG4: Stupid Mario Odyssey 2. He has more cameos in Ssenmodnar (series), SMG4: Stupid Mario World and SMG4: The Melancholy of Fishy Boopkins. Also, another person from SMG4: If Mario was in... Deltarune was mistaken by Mario to be Barney.