From the Super Mario Wiki
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Muss T. is a Toad who is seen standing by the gaping hole where Princess Peach's Castle used to be in Paper Mario. "Muss T." is a pun on the word "musty". A letter can be delivered to him in the game, but other than that, he has no real purpose.
"He's a Toad. He never fails to go for a walk, even if it's nasty out. He also loves cleaning for some reason. He cleans like crazy!"