From the Super Mario Wiki
“Oh, welcome, young fella! I'm the elder of Koopa Village. Folks call me Koopa Koot. Say...might you do me a favor?”
Koopa Koot is an elderly Koopa Troopa that lives in Koopa Village. He is friends with Goompa and Bootler. During his youth, the three traveled the globe in search of adventure. However, his adventuring days are now over. In fact, he needs other people to run errands for him. In Paper Mario, Mario helps Koopa Koot perform twenty tasks that the old Koopa cannot do by himself. One errand involves Mario retrieving a picture of the three old adventurers (Koopa Koot, Goompa, and Bootler) from Boo's Mansion. Often, Koopa Koot rewards Mario with a single Coin. Occasionally, Mario receives a better reward, including Star Pieces or memberships to the game parlor in Toad Town.
In Paper Mario: The Thousand-Year Door, Bowser, when asked who he is by Bub or Pennington, the player can choose to tell them his name is Koopa Koot, which the Bowser describes as an "all-time ancient babbler" that threatens to "bore [them] to death."
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