Spike Koopa

From the Super Mario Wiki

Three Spike Koopas guarding Bowser's treasure hoard.

Spike Koopas are short Koopa Troopas found in Mario Party. Spike Koopas are possibly one of the most obscure species in the Mario series. They are found exclusively in the mini-game Key-pa-Way. Their role is to prevent all four characters from unlocking the door to the Treasure Chest. If a character comes in contact with one, he or she will be stunned or drop the Bowser Key. Luckily, they can be easily avoided by jumping and tossing the Bowser Key.

They are probably minions of Bowser as they are seen guarding the Bowser Key. In the mini-game, there is also a barrel with Bowser's head stamp in front of the locked door, indicating the Spike Koopa are protecting Bowser's stash. Spike Koopas have purple, spiky shells and are small, making them probable close relatives of the Spiny.

Koopa Characters
Abominable Snowkoopa \| Baby Bowser \| Boom Boom \| Bowletta \| Bowser \| Bowser Jr. \| Bowser's father \| Bowser's sister \| Clawdia Koopa \| Giga Bowser \| Iggy Koopa \| King Koopa's great-great grandkoop\| \| King Koopa's mother \| Koopa Kid \| Koopalings \| The Koopalings' great grand-Koopa mama \| Larry Koopa \| Lemmy Koopa \| Ludwig von Koopa \| Morton Koopa Jr. \| Poopa La Koopa \| Roy Koopa \| Tutankoopa \| Wendy O. Koopa
Koopa Species
Chargin' Chuck \| Dark Striker \| Electro-Koopa \| Gold Koopeleon \| Koopa Striker \| Koopeleon \| Mad Green Koopa \| Mecha-Koopa \| Rocky Wrench \| Snooze-A-Koopa \| Soopa Striker \| Spike Koopa \| Toopa Striker