E. Gadd
Professor E. Gadd, full name Professor Elvin Gadd (or sometimes Dr. E. Gadd; known as "Professor Oyama" in Japan) has made a number of appearances in different Mario games, each time appearing as a mad, but friendly, gadget-inventing scientist.
The scientist's name comes from "egad," a word used as a mild exclamation.
E. Gadd debuted in Luigi's Mansion as one of the main characters. Luigi enters the mansion and is saved from ghosts by a strange old man wielding a vacuum cleaner. Professor E. Gadd reveals he lives in a house near the mansion, where he researches his favourite subject — ghosts. Luigi explains his brother Mario is missing within the house, and the professor decides to help Luigi by giving him two of his inventions, the Poltergust 3000 and the Game Boy Horror, the professor continues to help Luigi throughout the game, giving him help and tips.
In Super Mario Sunshine, when Mario finds FLUDD, it says: "Thank you for purchasing this item from Gadd Science, Inc." Later, Bowser Jr. says he got his magic brush from "A strange old man in a white coat" This is a fitting description of Professor E. Gadd, which is further confirmed when FLUDD seems to react in surprise to the statement. There is a symbol both on the Magic Paintbrush and FLUDD, showing a face and hairstyle similar to E. Gadd's.
In Mario & Luigi: Superstar Saga the professor makes an appearance supplying the brothers with an array of accessories to help them along their way, after they try each drink at Starbeans Cafe, a coffeehouse that he owns. However, it has been found that originally, the game was only going to feature Professor E. Gadd once, the first time you get a drink. In all of the other ones, it features a different character. These characters are Wario, Samus Aran, Fox McCloud, Link, Excitebike racer, and Captain Olimar.
In Mario & Luigi: Partners in Time the professor debuts his newest invention to the Mushroom Kingdom, a time machine. However, when Princess Peach ends up stuck in the past, the E. Gadd provides the brothers a suitcase enhanced with artificial intelligence named Stuffwell to help them on their quest. The heroes later meet his younger self, who is researching the behavior of Thwomp Volcano. The younger E. Gadd later mentions his interests in studying ghosts.
In Mario Party Advance, the player can use the coins earned in the mini-games to buy Professor E. Gadd's zany "Gaddgets". In Mario Party 6 Professor E. Gadd appears in his own board, E Gadd's Garage. Players see him when they land on a ? space and usually get to try one of his inventions.
Inventions of Gadd Science, Inc.
The following is a brief list of some of E. Gadd's inventions that have appeared.
Poltergust 3000
A modified vacuum cleaner designed to entrap ghosts. It also has a "blow" function which allows it to expel elements it sucks up such as fire, water, and ice. Luigi uses this in Luigi's Mansion to defend himself from the many ghosts; it also makes a return in Mario Power Tennis where Luigi uses it as his defensive Power move, using its suction power to retrieve the ball.
Super Poltergust 3001
An advanced version of a Poltergust 3000. It has the same functions as the Poltergust 3000, but is much larger because it can be ridden on. When ridden, it hovers over the ground. It can move at high speeds. E. Gadd uses briefly it in Mario & Luigi: Superstar Saga.
Poltergust 4000
The vehicle used by Luigi in Mario Kart DS to race in. It is similar to the Super Poltergust 3001, though it does not float. The "barrel" of the car the area Luigi sits on, and the nozzle on the ground. Emblems are placed on both sides of the barrel.
Game Boy Horror
A portable device (that bears a striking resemblance to the Game Boy Color) containing a built-in camera which E. Gadd can watch the action from the safety of his lab and contact Luigi. It also stores data including a map and anything Luigi has collected, and contains a special radar called the Boo Radar to find hidden spherical objects.
Game Boy Horror SP
The upgraded version of the Game Boy Horror, given to Mario by E. Gadd in Mario & Luigi: Superstar Saga. It is another portable device (this time bearing striking resemblence to a Game Boy Advance SP). It makes items rarely dropped by enemies always be dropped by enemies. Originally going to be merely the Game Boy Horror.
Ghost Portrificationizer
A large machine which works in conjunction with the Poltergust 3000, certain ghosts captured can be entrapped in portraits to be hung in E. Gadd's gallery. The machine also works in reverse, which was utilized to free Mario from the painting he had been trapped in by King Boo.
FLUDD
The Flash Liquidizer Ultra Dousing Device, or FLUDD, is a water-spraying backpack used by Mario in Super Mario Sunshine. It has various nozzle attachments which can be collected by breaking open boxes with E. Gadd's logo on the front. FLUDD also has notable artificial intelligence and the ability to communicate with a voice. In certain ways, FLUDD functions much as Navi did in The Legend of Zelda: Ocarina of Time.
Magic Brush
This is used by Bowser Jr. (as Shadow Mario) in Super Mario Sunshine. It is a large paint brush with the ability to paint various colours and even create enemies. It is unclear why the brush was made as well as why it was given to Bowser Jr., though some fans claim E. Gadd was tricked by Bowser Jr. using his Mario costume. In Mario Power Tennis Bowser Jr. uses his Magic Brush to perform special moves.
Time Machine
Used by Princess Peach to visit the past at the beginning of Mario & Luigi: Partners in Time. It is powered by the Cobalt Star.
Stuffwell
An intelligent suitcase used by the Mario Brothers on their quest in Mario & Luigi: Partners in Time. Its purpose is to manage the brothers' inventory and display their current status. It is known to mispronounce large vocabulary, sometimes mix up two words, and upon ending its speeches, says "BACK TO ADVENTURE!"
Starbeans Café
The café in the beanbean kingdom, made by E. Gadd. Strangely enough, it does not have any toilets. At one point, E. Gadd puts up a larger-than-life-size portrait. Every time Mario and Luigi mix a new drink, E. Gadd visits.
Ghost Suit
A pale blue jacket that, when worn, turns characters into a ghost. When E. Gadd wears this in Mario and Luigi: Superstar Saga, Luigi gets scared and vacuums him.
The Gaddlight
A flashlight that is used to scare away Boos when they try to steal a Star or coins in Mario Party 4.
Hydrogush 4000
A large water pump used in Mario & Luigi: Partners in Time. It's not portable like the FLUDD, but it does have a lot of power.
DS Time Radar
A handheld device (that bears a striking resemblence to a Nintendo DS) used briefly by E. Gadd to find Princess Peach in Mario & Luigi: Partners in Time. It has the ability to pinpoint which time period someone is trapped in. One of the Toads thinks he just made it up. Also, when Professer E. Gadd turns on his Hydrogush 4000, he uses a DS-like device again.
Coin Vacuum
A vacuum from Mario Party 7. It is a capsule item exclusive to Wario and Waluigi. It doesn't look much like the Poltergust 3000. Rather, it is yellow and purple (much like the two characters that use it), and features the E. Gadd logo. It is used to steal coins from other players.