Mecha Fly Guy
From the Super Mario Wiki
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Mecha Fly Guys first appear in Mario Party, where the Mecha Fly Guy is sold in the Mushroom Shop for one-hundred coins. After being purchased, it is sent to the Mini-Game House. Selecting it makes the player play a game, where they have to rotate the as many times as possible for ten seconds. The Mecha Fly Guy then flies around the room until it falls on the floor. It then says how long its flight was, and how many times the player rotated the . It then makes a comment on how the player did.
Mario Party 2
In Mario Party 2, Mecha Fly Guys only appear in the minigame Mecha-Marathon. In this minigame the players have to wind up the Mecha Fly Guy until they release it, making the Mecha Fly Guys fly. The player with the Mecha Fly Guy who flew the farthest wins. The color of the Mecha Fly Guy matches the character that uses it.
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