Koopa Koot's favors

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 Kooper joins Mario's party

 * 1) Koopa Koot wants to read the book Koopa Legends, and Kolorado is the only person with a copy. The player must head a few doors down from Koopa Koot's house to Kolorado's house and ask Kolorado's wife for it. Reward: 1 coin
 * 2) Koopa Koot has been having trouble sleeping lately and wants a Sleepy Sheep to make him sleep better. The player can buy one of these from the Shroom Grocery in Toad Town. There is also one in Pleasant Path. Reward: 1 coin, Silver Credit

After Chapter 1

 * 1) A long time ago, Koopa Koot loaned Goompa a Tape and now wants it back. The player must go to Goomba Village and talk to Goompa to retrieve it. Reward: 1 coin
 * 2) Koopa Koot wants a cup of Koopa Tea. To make one, the player must give a Koopa Leaf to Tayce T.. They can be found in the bushes of Koopa Village. Reward: 3 Star Pieces
 * 3) Koopa Koot states that he is a big fan of Luigi. The player must go to Mario's House and ask him for an autograph. Reward: 1 coin

After Chapter 2

 * 1) Koopa Koot has lost his wallet. It is found in one of the bushes near the Save Block in Koopa Village. Reward: 1 coin
 * 2) Koopa Koot wants a Tasty Tonic. The player can buy one in Harry's Shop in Toad Town or have Tayce T. make one using certain ingredients, a Lime, Lemon, Bubble Berry, or Coconut, at simplest. Reward: 1 coin
 * 3) Koopa Koot now wants an autograph from Merluvlee. The player must talk to her in Shooting Star Summit, but before she can hand over the autograph, she wants a Crystal Ball from her sister, Merlee. The player must head to Dry Dry Outpost and ask her for the Crystal Ball. After giving that to Merluvlee, she gives the player the autograph. Reward: 3 Star Pieces

After Chapter 3

 * 1) Koopa Koot wants to know what is going on in the Mushroom Kingdom. The player must go to Toad Town and read the front and back of the sign near Merlon's house. Reward: 1 coin
 * 2) Koopa Koot wants a Life Shroom. The player can buy one from Igor's shop in Boo's Mansion. Reward: 1 coin, Gold Credit
 * 3) Koopa Koot now wants a Nutty Cake from Tayce T., made with a Goomnut. Goomnuts can be found in the tree in front of the Goomba family's house in Goomba Village. Reward: 1 coin

After Chapter 4

 * 1) Koopa Koot cannot tolerate with the noise coming from next door in Kooper's house. The player must speak to the Bob-ombs, who were apparently making the noise, with Bombette present to calm them down. Reward: 3 Star Pieces
 * 2) Koopa Koot wishes to reminisce about the old days when he made friends with the Boos in Boo's Mansion. The player must get the Old Photo back from Franky, the first Boo the player encounters upon entering the mansion. Reward: 1 coin
 * 3) Koopa Koot wants some Koopasta from Tayce T., made with a Koopa Leaf and Dried Pasta. The Dried Pasta can be purchased from Little Mouser's Shop in Dry Dry Outpost. Reward: 1 coin

After Chapter 5

 * 1) Koopa Koot has lost his glasses. Once again, they can be found in one of Koopa Village's bushes. Reward: 1 coin
 * 2) Koopa Koot wants a Lime, which can be found in the tree on the right in the oasis in Dry Dry Desert. Reward: 3 Star Pieces
 * 3) Koopa Koot now wants a Kooky Cookie, which is made with a Koopa Leaf and a Cake Mix. The Cake Mix can be obtained after defeating certain Shy Guys in the playground of Shy Guy's Toy Box. Reward: 1 coin

After Chapter 6

 * 1) Koopa Koot needs a package from a Boo in Gusty Gulch. The player must head over there and talk to the Boo near the Save Block. The Boo says he needs to look for it first, so the player must then leave the area, come back and talk to him, and the Boo will hand over the package. Reward: 1 coin
 * 2) Koopa Koot wants a Coconut, so the player must find one in Lavalava Island in one of the palm trees near Yoshi's Village. Reward: 1 coin
 * 3) For Koopa Koot's final errand, he wants a Red Jar given out at Little Mouser's Shop in Dry Dry Outpost. There, the player must buy the following items in order: Dusty Hammer, Dried Pasta, Dusty Hammer, Dried Shroom. Little Mouser gets the hint and promptly hands it over. Reward: 3 Star Pieces

After this, Koopa Koot's last "favor" is simply for Mario to defeat Bowser. Koopa Koot does not reward Mario for doing this.

Quotation
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.

Trivia

 * The concept of Mario doing favors and running errands for people would be recycled in Paper Mario: The Thousand-Year Door with the inclusion of the Trouble Center.