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Old Man Hobo (Usually referred to as the Old Man or Old Guy), is a senile old man who sometimes appears in SMG4's bloopers. He's possibly a mascot of SMG4 because he is at the bottom right corner of his videos. There are in fact several Old Men.
Not all of the Old Men Hobos are actually hobos, as some are shown to be genies, wizards, princesses (surprisingly), killers, or rapists. He has appeared less often in favor of Meggy, Bob, and Fishy Boopkins, but returned in SMG4: Mario Gladiators, this being one of his main last known appearances, as well as SMG4: Mario And... The Well.
Super Mario 64 Bloopers
War of the Fat Italians