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Th Bartender is a one-time character in the SMG4 universe.
After falling off a dragon that took Princess Peach. Mario lands in a tavern, accidentally spilling the Dragonborn's drink. The bartender greets Mario, but Mario insults him by saying that he’s ugly. He then tells Mario about the Dragonborn and how he slays dragons. Mario then decides to get the Dragonborn's help to save Peach. Before going the bartender gives Mario Tic Tacs (Which helps him to defeat the dragon).
He later appears dancing after Mario defeated the dragon.