From the Super Mario Wiki
“...Did you call, Master? I am the Mushroom Genie who lives in the magic lamp. Very well! I shall take you to the Millennium Star! Jump on my back! Hang on tight! Here we go!!! Mushroom-Kadabra!”
The Mushroom Genie is a magical entity first appearing in Mario Party 2. When a player uses a Genie Lamp, the Mushroom Genie appears and takes them to the board host, from whom a star can be purchased. He reappears in Mario Party 3, and also has a counterpart in this game: the female Mushroom Jeanie of the Lucky Lamp, who will instead change the star's location. His role was replaced by the Genie of the Lamp in Mario Party 4 and the Flutter Orb in Mario Party 5 onward.
The Mushroom Genie makes a small appearance in issue 27 of Super Mario-Kun. After getting attacked by a Thwomp, Mario rubs a Magic Lamp. Here, the genie is seen carrying Mario, Luigi, Yoshi, and Wario away from an evil face, preventing them from falling into it.
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