The title of this article is conjectural; an official name for the article's subject has not been found, so it has been given a fitting title by editors. If an official name appears, it is requested that the article be moved to the correct name.
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 Sm3 questions. They see the Blue guy, whose back faced them making him look like SMG4. When they walked to him, he turned around and looked 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.