Sue Pea

Sue Pea, the Dozing Girl (Japanese: スー・ピー Sue Pea), is a seven year old portrait ghost that died in her sleep. Her name is a pun on either "pea soup" or "soupy". During the events of Luigi's Mansion, Sue Pea resides in the Guest Room on the second floor of the titular mansion. This portrait ghost spends her afterlife sleeping in the bed of the Guest Room, hidden away as to not be awakened. Strangely, the Guest Room is upside-down, so Sue Pea sleeps in a bed attached to the room's ceiling, instead of the floor. Luigi does not need to capture Sue Pea to help find his brother Mario, however, if the green-clad ghost-hunter manages to capture the portrait ghost, he is rewarded with Sue Pea's magnificent treasure.

When Luigi first enters the Guest Room, the plumber finds Sue Pea sleeping in her bed on the ceiling. After examining her heart with the Game Boy Horror, Luigi discovers that Sue Pea promises to never wet the bed. As such, to begin the battle with the slumbering ghoul, Luigi has to spray water from his Poltergust 3000 at Sue Pea. Fortunately, a vase in the adjacent room produces Water Elemental Ghosts, providing the water Luigi needs to douse Sue Pea. After spraying her three times, Sue Pea's heart is exposed and Luigi could pull her in with the Poltergust. But first he needed to deal with the dolls Sue Pea levitates and tosses at the hero, dealing five Hit Points of damage with each successful strike. If Sue Pea falls back to slumber, she just has to be doused by water again. Ultimately, Luigi sucks up the portrait ghost.

After capturing Sue Pea, the Guest Rooms light activates and a treasure chest appears on the ceiling. Unfortunately, the chest is out of reach for Luigi. Distraught, Luigi leaves the room. After closing the door, the green-clad hero hears (and feels) the mansion rumble. Returning to the Guest Room, Luigi discovers the entire room had turned right-side up. With the Treasure Chest now accessible, Luigi opens the box and claims a Gold Bar and a Silver Diamond (among other minor treasures). The plumber can also collect a Blue Stone by watering the plant in the corner of the room.

Trivia

 * In the bronze frame, Sue Pea is upside down. This is an obvious reference to how she was sleeping in an upside down guest room.
 * A black-and-white picture of a person similar in appearance to Sue Pea can be found on the north wall of the Guest Room, possibly depicting her when she was alive.