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Polterpup is a playful ghost canine that appears in the Luigi's Mansion series. He was formerly a minor antagonist in Luigi's Mansion: Dark Moon, but later redeems himself as he serves as Luigi's pet and ally in Luigi's Mansion 3.
Polterpup is a friendly, playful and rambunctious ghost that likes to explore and occasionally gets into mischief. In Luigi's Mansion: Dark Moon, Polterpup's rowdy nature became a hindrance for Luigi during his quest to reassemble the titular moon, but showed remorse for his actions after the moon was restored. Although this seems to suggest Polterpup's behaviour was influenced by the Dark Moon (like many ghosts in Evershade Valley), Professor E. Gadd believes that all Polterpup really needed was an owner to take good care of him. In Luigi's Mansion 3, Polterpup is seen to be as boisterous as before but more considerate to Luigi.
Luigi's Mansion: Dark Moon
Polterpup first appears at Gloomy Manor, playing with a gem he found outside the Mudroom until it gets stuck in a tree. He is encountered again at Haunted Towers where Luigi is forced to capture Polterpup after the ghost snatches a key found in the Rooftop Pool area. Polterpup is taken to E. Gadd's Bunker for containment only to immediately escape from captivity and unintentionally cause more trouble at the Old Clockworks and Treacherous Mansion before he was caught again. After the Dark Moon is restored following King Boos capture, Polterpup is set free along with the other ghosts of Evershade Valley and approaches Luigi feeling guilty about all the trouble he caused him. However Luigi forgives Polterpup and decides to keep him as a pet.
If Luigi has collected any Gold Bones during the game, Polterpup will appear to revive him if his health is depleted.
Luigi's Mansion (3DS)
Polterpup will appear in the game if Luigi loses all his health after receiving a Gold Bone by scanning an Luigi Amiibo.
Luigi's Mansion 3
Polterpup travels with Luigi and company to the Last Resort for a luxurious vacation. However he decides to explore the hotel on his own when the illusion masking its true appearance begins to fade. After Luigi escapes King Boo, Polterpup helps him find the Poltergust G-00 in the Garage and shows him how to use it before leading him to find Professor E. Gadd. Polterpup later assists Luigi in the Boilerworks by getting him to dry land when the Reservoir fills up with water. The ghost dog is again present when Polterkitty steals an Elevator Button for a second time and joins Luigi in tracking the cat through different floors to retrieve it.
During the final confrontation with King Boo on the Rooftop, Polterpup unintentionally saves Luigi by pushing him to one side before he could be imprisoned inside a portrait. King Boo attempts to pull the entire resort into the painting, which causes the building to collapse with Luigi on it. But Polterpup rescues him once again by grabbing him in midair before he could hit the ground.
Super Smash Bros.
The Polterpup appears as a trophy in Super Smash Bros. for Nintendo 3DS and is also a Support Spirit in Super Smash Bros. Ultimate.
- According to a Swapnote message sent by Shigeru Miyamoto, Polterpup is his favorite ghost.
- Professor E. Gadd believes Polterpup's dog breed to be "…something like a silver retriever!"