Old Man Watchitt
From the Super Mario Wiki
Old Man Watchitt (also known as simply "Watchitt") is the mayor of Yold Town. He is a minor character that doesn't let Mario progress until he finds the Pixl named Thoreau in town. In the Piccolo side quest, he'll give the player the "You-Know-What" in exchange for an autograph from Merlumina in Chapter 1-4, Yold Ruins. It is also suggested by Tippi that Watchitt's grandson, Bozzo, may be mayor someday.
He has a habit of yelling "WATCH IT!" often. He is the cousin of Bestovius. According to Tippi, Watchitt also tends to talk to his beard and cane, and stays current with the latest gadgets. Possibly, the most defined characteristic of Watchitt is his gruffness. His Catch Card describes him as "crotchety" (see below). This is made apparent in his first speech, which, as his speech tends to be, was riddled with 'watch it's. According to Bestovius, he got angry at him when all he did was float over his rug.
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