Mecha Fly Guy
From the Super Mario Wiki
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In Mario Party, the Mecha Fly Guy is sold in the Mushroom Shop for 100 coins. After being purchased, it is sent to the Mini-Game House. Selecting it makes people play a little game, where they have to rotate the as many times as possible for ten seconds. Then, the little toy flies around the front of the room until it falls on the floor. Then it says how long its flight was, and how many times the player rotated the . Then it makes a comment on how well (or how poorly) the player did.
Mario Party 2
Mario Party: The Top 100
After a long absence, the Mecha Fly Guy returns in Mario Party: The Top 100, where players can use it to steal an opponent's item. Mecha Fly Guys also return in the Mecha-Marathon minigame, having the same role as Mario Party 2. However, they are now color-coded by player number (red, blue, green, and yellow for players 1-4 respectively) rather than character.
Official description from Mario Party: The Top 100
Mecha Fly Guy:
This handy wind-up toy can snatch an item away from one of your rivals.
Names in other languages