Red Boo

Red Boos, also known as Pink Boos, are enemies that appear in the Mario games. They are stronger versions of the regular white colored Boos.

Super Mario Sunshine
Red Boos are only seen in Hotel Delfino of Sirena Beach of this game. The Red Boos can be sprayed with water from F.L.U.D.D. and they turn into platforms for Mario to access higher areas. Red Boos cannot be defeated at all in this game unlike the regular Boos.

Mario Party series
In Mario Party 4, a single Red Boo appears on the Boo's Haunted Bash board. Going past her either makes her appear or disappear. Due to the Red Boo's presence, the other white Boos and the Haunted Train disappear until the larger Red Boo disappear. Certain areas can now be accessed as long as the large Red Boo is shown.

In Mario Party 6, a Red Boo plays a large role of the board games. She now can steal stars and/or coins for players on certain boards. More Red Boos appear mainly in the Duel Mini-games.