Koopa Kid

Koopa Kid is Bowser's henchman in Mario Party 2, Mario Party 3, Mario Party 4, Mario Party 6, and Mario Party 7. He is a playable character in Mario Party 5.

Mario Party 2
Koopa Kid (called Baby Bowser) takes the place of the star once a player has taken it. If you land on his space he takes five coins. If a character wins a Bowser Bomb, the item will activate on its own and turns Baby Bowser into Bowser.

Mario Party 3
In this game, Koopa Kid now owns an Item Shop in the same location as the one owned by Toad on the board, with each turn randomizing whose shop will come up as a player passes. Koopa Kid's items are all the opposite of ones sold in Toad's store (Example: Toad sells Boo Repellent while Koopa Kid sells Boo Bells), except for the Item Bag and the Skeleton Key. Koopa Kid also appears in several of the Mini-Games, serving as the "losing prize" in the Item Mini-Games.

Mario Party 4
Koopa Kid makes a minor appearance in Mario Party 4 as the character who explains the rules of Bowser Minigames and takes your coins if you land on a Bowser Space.

Mario Party 5
In Mario Party 5, the Koopa Kid is an unlockable character after you beat the game. You can use him to beat the different boards.

Mario Party 6
In Mario Party 6, Koopa Kid appears as Bowser's aid. He does all of the on-board work. He also appears in Bowser Minigames.

Mario Party 7
In Mario Party 7, he has a space named the Koopa Kid Space which charges players if they land on it. Three multicolored Koopa Kids appear in Bowser Minigames. This is also the last appearance of the Koopa Kids.