Koopa Koot's favors
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In Paper Mario, the elderly Koopa Koot of Koopa Village will ask Mario many favors throughout the game. Some of the favors require Mario to meet specific people and get an item in return. For every four favors Mario does for him, Koopa Koot will give Mario Star Pieces, making this sidequest a necessity to fully complete the game.
After Chapter 1
After Chapter 2
After Chapter 3
After Chapter 4
After Chapter 5
After Chapter 6
After this, Koopa Koot's last "favor" is simply for Mario to defeat Bowser. Koopa Koot does not reward Mario for doing this.
When Koopa Koot thanks Mario for doing his errand, he usually quotes a kind of enemy or something else from the game. Here is a list of them.