The Koopa Kids are minions of Bowser who only appear in the Mario Party series. They are known as Mini-Bowsers in PAL territories, Mini Koopa in Japan (Bowser's name in Japan is Koopa) and Baby Bowsers in Mario Parties 1, 2, and 3. The Koopa Kids resemble miniature versions of Bowser (and are therefore very similar in appearance to Bowser Jr. and Baby Bowser). Originally, the Koopa Kids were nothing more than minions indirectly fought by the Mario crew when the Koopas attempted to crash their parties, but in Mario Party 5, one was finally made playable (despite this, Bowser shows them no mercy when they land on his space. This is obviously so players using Koopa Kid do not have an advantage).
It is unknown how many Koopa Kids there are. Originally, there seemed to be only a few, but Mario Party Advance implied there may be hundreds of them.
Mario Party 5 also introduced Green K. Kid, Red K. Kid and Blue K. Kid who, as their names imply, are colored differently. The aforementioned colored kids are one Koopa Kid split into three. It is unknown if other Koopa Kids are also capable of duplicating like this.
Koopa Kid's future is uncertain, as he does not appear in any games following Mario Party 7. Additionally, Bowser Jr. has started appearing in the Mario Party series since Mario Party DS, implying that Koopa Kid may have been retired in favor of him.
The Koopa Kids made their debut appearance in the original Mario Party, as Bowser's henchmen, however despite being his henchmen, they are not seen until the end of the game.
After beating Bowser's board, Bowser will steal all the stars that the player collected throughout the game. Next he travels to the Eternal Star board, where he sets up base until the players find him, but before they can get the stars back, Bowser summons a group of seven Koopa Kids and forces the players to challenge them to the board.
When the players challenge the Koopa Kids, they must play the same way they did with their previous opponents, but this time if the players get close to a Koopa Kid they must challenge them to a mini game. The mini game involves jumping underneath a numbered block and the key to winning the game is whether the player selects a higher number than their opponent.
Following success and defeating the original group of Koopa Kids, a new group appears and the player must start all over again. Once the new group is defeated, the board is won and the players will use their stars to beat Bowser. Eventually the Koopa Kids and Bowser are sent flying into the air.
Mario Party 2
In Mario Party 2, Koopa Kid appears on every board in the game, where he often causes trouble for the players. He does the following:
Also in this game, the player is able to win a Bowser Bomb in Item Mini-Games. If this happens, Koopa Kid turns into Bowser, rolls 3 dice blocks, moves that many spaces, and steals all of each player's coins that he passes.
Despite mostly hindering the players, they do help them at times, but only if the players rank low.
More Koopa Kids appear in Bowser Land, where one of them replaces Toad as the host of the board, while another one was also seen later on the board where he appeared to be the leader of the Bowser Parade. He stands behind the player who decided to go on it and then keeps it going on for a while until it comes to a complete stop.
There is also a Bowser Bank manned by a Koopa Kid Banker that will trade any amount of coins to the player in exchange for 20 coins but if the players don't have enough coins then the Koopa Kid Banker will send them back to where they started. Interestingly, unlike the other Koopa Kids who are the same color as Bowser, the Koopa Kid Banker is a blue Koopa Kid with glasses.
Last, there is an item shop in Bowser Land that is owned by a Red K. Kid wearing a monocle. He will forcibly give the players any random item he has, but most of time, it hinders players and deals damage to them.
Mario Party 3
In Mario Party 3, Koopa Kid ran his own Item Shop, which sometimes appears in place of Toad's, where he sold sneaky items such as Lucky Lamps, Reverse Mushrooms and Boo Bells. Koopa Kids also appear in the Item Minigame, where they often symbolize losing, such as the Koopa Kid space in Winner's Wheel.
In Duel Mode, Koopa Kid also appears as one of the possible partners. He isn't a default partner, but can be obtained through the lottery. His attack is one, and his health is one. He can occasionally turn into Bowser and deal triple damage when attacking; however, if the transformation fails, he deals no damage. Koopa Kid's salary is three coins per turn.
Mario Party 4
In Mario Party 4, a Koopa Kid would usually come in place of Bowser whenever someone lands on a Bowser Space, and would steal Coins from either the player who landed there, or from all the players. Sometimes, the Koopa Kid would then call Bowser after stealing coins, and a Bowser event would begin. In the Bowser Minigames, two Koopa Kids work as Bowser's servants; one of which is seen fanning him and the other one explains the rules to the game (which may be Fruits of Doom, Darts of Doom or Balloon of Doom) and in addition, he also brings the dart board to the players and announces the scores in Darts of Doom. One also hosts the last board: Bowser's Gnarly Party and is seen selling items and hosting board games. In addition, Koopa Kid can be unlocked in the volleyball minigame.
Mario Party 5
Mario Party 5 marked the first time Koopa Kid is playable, but not in the Story Mode. In the Story Mode, Koopa Kid split up into Red K. Kid, Blue K. Kid and Green K. Kid, and the player has to steal all their coins on abridged versions of the regular boards to defeat them. In Card Party, Koopa Kid shows up to cause trouble on the Bowser Card. In the PAL version of Mario Party 5, they are called Mini Bowser, Red M. Bowser, Blue M. Bowser and Green M. Bowser.
Mario Party 6
In Mario Party 6, Koopa Kid retains a role similar to that in 5, except that Red K. Kid, Blue K. Kid and Green K. Kid were the rivals in the Solo Mode, and the goal was not to defeat them. Rather, they just served as opponents during Minigames.
Mario Party 7
In Mario Party 7, Koopa Kid is no longer playable. Instead, he appears whenever someone lands on a Koopa Kid Space, and will do things such as swapping players' coins or positions, or use a Cursed Mushroom on the player/team who lands on his space. Red K. Kid, Blue K. Kid and Green K. Kid were also the main antagonists in the three multiplayer Bowser minigames, and operates the cannons in Bowser's Enchanted Inferno!.
Mario Party Advance
In Mario Party Advance, Koopa Kids could be seen working with Bowser, and appear in some of his minigames, where the object was usually for the player to defeat them. Up to ninety-nine of them could appear at once. One main Koopa Kid appears throughout the game as Bowser's right-hand man, often appearing to antagonize the player by doing things such as stealing Mushrooms from them or flinging them somewhere else on the Board Map.
In Mario Party 4, whenever a Koopa Kid calls for Bowser, he refers to him as "Dad". However, it is unlikely that Bowser is the biological father of all the Koopa Kids, and that the Koopa Kids may just be clones of some nature. Bowser's real son is Bowser Jr. Similarly, Bowser also grounds them by taking away their Mario action figure if they fail him, hinting that Bowser at the very least has a father-like relationship with them. It's possible that Koopa Kid has a teacher-student relationship with Bowser since he calls him "Mr. Bowser". While the small Koopa shows a lot of loyalty to Bowser, he also takes the side of Mario and company every once in a while, as evidenced in Mario Parties 5 and 6. It is also likely that Koopa Kid works for Bowser for money, due to him telling himself, "I bet Mr. Bowser will totally give me a raise after this!" However, when the player plays as Koopa Kid in Mario Party 5 and Mario Party 6, Bowser doesn't hold out when he lands on a Bowser Space, indicating Bowser may not like Koopa Kid or it is just because of the game mechanics.
List of Appearances by Date