Professor E. Gadd with the Poltergust 3000 as seen in Luigi's Mansion.

Professor Elvin Gadd (Professor Oya Mā/Oya Mā Hakase) in [[Wikipedia:Japan|Japan), more commonly known as E. Gadd, a fictional chararacter in Nintendo's Mario franchise. He is a scientist who, with his various inventions, helps Mario and his friends. In Japan, he is named after Nintendo game designer Yoshiyuki Oyama. He first appears in ''Luigi's Mansion'', in which he investigates the mansion that mysteriously appeared by his house. To help him study the ghosts in the mansion, he uses the "Poltergust 3000", a high-powered vacuum cleaner that can be used to suck in and capture ghosts, and the "Game Boy Horror", an invention for tracking and detecting objects, such as boos. He lends it to Luigi, and helps him on his quest. It is also a kart in Mario Kart DS. Other major inventions include his FLUDD--a Flash Liquidizer Ultra Dousing Device--and Magic Brush used in Super Mario Sunshine. In Mario Party 6, E. Gadd is featured on a party board called E. Gadd's Garage. He later appears in Mario & Luigi: Partners in Time where he creates a time machine. He also makes brief appearances in Mario & Luigi: Superstar Saga with various inventions as rewards for making bean coffees at the Starbeans Cafe.

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