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Blue Guy is a character who looks exactly like SuperMarioGlitchy4, except his skin was blue. He only appeared in "The Mystery of the Missing White and Blue (40,000 subs special)". His name is unknown.
He was first introduced when Starman3 and Mario try to find SMG4, who they say is missing. Mario puts up "wanted" signs for SMG4, which SMG3 questions. They see the Blue Guy, whose back is facing away from them, making him look like SMG4. When they walk over to him, he turns around and looks at them. After a small talk, he tells them he can't find their friend and walks away. Later on, a Policeman is seen chasing him because he saw SMG4 on the "wanted" posters, which should have been "missing" posters.