Pink Boo
Pink Boos are an enemy species found in the hotel in Super Mario Sunshine. As their name implies, they are pink Boos.
MP6 Boo

white boo with Pink boos.

You can clearly spot how sleepy they are while playing the game. When you spray water on them they turn into pink platforms that will turn back into a Pink Boo shortly. Pink Boo also appeared in some Mario Party games games as well as Paper Mario: The Thousand-Year Door. They are found in King Boo's Haunted Hideaway in Mario Party 8 selling candy to players.