Gyro Gearloose is an anthropomorphic chicken created by Carl Barks for The Walt Disney Company, first appearing in Barks' 1952 comic Gladstone's Terrible Secret. He is part of the Donald Duck character cast, appearing in stories as a friend of Donald Duck, Uncle Scrooge, and anyone who is associated with them in any way.
Gyro is Duckburg's most famous inventor, even though his inventions don't always work the way he wants them to. His outrageous productivity is presented as a factor in the quality of his inventions; because he always comes up with new ideas, the fact that his inventions often lack an important feature, will often cause trouble for Scrooge or Donald who have bought the invention. He is known as being good-natured towards others. Gyro is often assisted by his Little Helper (or just "Helper"), who is a small robot with a light bulb for a head. Besides Little Helper, he has also a thinking cap, a combination of a roof-top and a nest, with three black birds living in it.
In high school, young Gyro was a baseball pitcher with his "madball" pitch - actually only a straight-ball pitch. When Gyro is forced to pitch for the Northside, pitting an "unhittable" baseball against another of his inventions, an "unmissable" baseball bat made for the Southside team, resulting in total chaos.
Some of Gyro's relatives include his father Fulton Gearloose, his grandfather Ratchet Gearloose, who worked as Scrooge McDuck's engineer on Scrooge's riverboat, the "Dilly Dollar" (as shown in The Fantastic River Race by Carl Barks), and Newton Gearloose, his nephew. His relatives are often named after famous inventors and scientists (Robert Fulton, Isaac Newton, Nicolaus Copernicus, Galileo Galilei, etc.). Like his son, Fulton was also an inventor, and one of the first members of the Junior Woodchucks. In some stories, Gyro's primary rival is Emil Eagle, although he is also antagonized by the Beagle Boys and Magica De Spell on occasions. With his inventions, he is also a very important ally of Donald Duck's alter ego, The Duck Avenger in the Italian Disney comics.
In this 1979 scratch-and-sniff book, Gyro invents a smell machine. There is an attempt to use the machine to get rid of a mothball odor. The machine can produce a lavender smell, a pepper smell, and a smoke smell, amongst others. The book was renamed and reprinted as Mickey Mouse Scratch and Sniff Book in 1990.
In the subsequent 1987 TV series DuckTales, Gyro became a regular character, with the late Hal Smith supplying his voice. Among Gyro's noteworthy inventions in the series is the creation of the Gizmoducksuit, intended to be worn by a security guard for Scrooge McDuck's Money Bin. Although Gyro's shop and house are on the south side of Duckburg, he was born on the north side ― a sign marks his birthplace and mentions one of his inventions - topless hats. Despite Flintheart Glomgold being an enemy of Scrooge's, Gyro built the giant construction robots for him in "Robot Robbers".
Gyro also appeared in both of the DuckTales NES games. In the first game, he appears only in the bonus stage that can be accessed if Scrooge exits a level with a 7 in the ten-thousand digit on the score. In DuckTales 2, he can be found in three of the levels, providing upgrades for Scrooge's cane. The HD remake of the first game gives Gyro an expanded role, prominently appearing in cut scenes in the African Mines and Moon levels. Here, he is voiced by Chris Edgerly.
Gyro makes a cameo appearance at the end of the episode "Down the Hatch", together with several other scientists. Notably, this is his only animated appearance alongside Ludwig Von Drake, with whom he does frequently interact in the comics.
Gyro appears in the reboot series as Scrooge's personal mad scientist, voiced by Jim Rash. In addition to being Scrooge's scientist, he is assisted by Fenton (as an intern) and Little Bulb like the original. In this series, Gyro has white hair and wears a green suit as opposed to his red hair and pink suit in the original series. His lab is now located in a basement beneath The Money Bin. He is also less friendly and more eccentric compared to most portrayals of the character. However, he still cares about his inventions and won't hesitate to stop them from doing further damage. He also utters out "blatherin' blatherskite", which was originally Fenton's expression, whenever he's frustrated and even named his newest idea, "Project Blatherskite". In the second season episode "What Ever Happened to Della Duck?!, it is revealed that he has worked for Scrooge for at least ten years, since Della Duck used his Oxy-Chew to survive in the moon.
In the Toontown storyline, Gyro created a robot that, when Scrooge accidentally wired it incorrectly, made the Cogs, the main antagonists of the game. They are grim businessmen-like robots who can't take a joke, so to take care of the infestation, the toons (the main protagonists of the game), destroy them with gags, such as squirting seltzer water and throwing pies at them.