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MarioStar92, formerly MarioStar64, is a cameo YouTuber who appears sometimes in SuperMarioGlitchy4's bloopers. He appeared in his old color code, back when he was known as MarioStar64. However, MarioStar92's code may just be a recycled code used for a random guy.
In the video "SMG4 Joins the Youtube Rangers", MarioStar92 appears just as one of the members of the YouTube Rangers but didn't have any actual roles. In the blooper "The Pink Problem", one of his most prominent appearances, he appears as the person who bought the last gloves of the shop.
In the episode "HalloWeegee Special 2014", "MarioStar92" is seen trying to escape the giant city-destroying Weegee and is telling everyone to run, only to see a Weegeefied SuperMarioGlitchy4 and scream. He also makes cameo appearances in the Ssenmodnar series.
Note: this list is probably incomplete.