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Mecha anime and manga, known in Japan as robot anime (ロボットアニメ, robotto anime) and robot manga (ロボット漫画, robotto manga), are anime and manga that feature robots (mecha) in battle. The genre is broken down into two subcategories; "super robot", featuring super-sized, implausible robots, and "real robot", where robots are governed by realistic physics and technological limitations.
Mecha series cover a wide variety of genres, from action to comedy to drama, and the genre has expanded into other media, such as video game adaptations. Mecha has also contributed to the popularity of scale model robots.
The 1940 short manga Electric Octopus (デンキダコ, Denki Dako) featured a powered, piloted, mechanical octopus.  The 1943 Yokoyama Ryūichi's propaganda manga The Science Warrior Appears in New York (科学戦士ニューヨークに出現す, Kagaku Senshi New York ni Shutsugensu) featured a sword-wielding, steam-powered, giant humanoid mecha.  The first series in the mecha genre was Mitsuteru Yokoyama's 1956 manga Tetsujin 28-go (which was later animated in 1963 and also released abroad as Gigantor ).  Yokoyama was inspired to become a manga creator by Osamu Tezuka, and began serializing the manga in Shonen, an iconic boy's magazine, in 1956.  In this series, the robot, which was made as a last-ditch effort to win World War II by the Japanese military, was remote-controlled by the protagonist Shotaro Kaneda, a twelve-year-old detective and "whiz kid".  The story turned out to have immense mass appeal, and inspired generations of imitators. 
In 1972, Go Nagai, another of Japan's greatest manga creators, defined the super robot genre with Mazinger Z , which was directly inspired by the former series.  He had the revolutionary idea to create a mecha that people could control like a car, while waiting to cross a busy street.  The concept became "explosively popular", making the manga and anime into a success.  The series also was the genesis for different tropes of the genre, such as the idea of a robot as a "dynamic entity" that could join with other machines or humans to become unstoppable.  Anime critic Fred Patten wrote that almost all mecha anime plots, such as monster of the week shows, were actually metaphors for re-fighting World War II, and defending Japan and its culture from Western encroachment. 
By 1977, a large number of super robot anime had been created, including Brave Raideen and Danguard Ace .  The market for super robot toys also grew, spawning metal die-cast toys such as the Chogokin series in Japan and the Shogun Warriors in the U.S., that were (and still are) very popular with children and collectors.  The super robot genre became heavily commercialized and stagnant, creating an opening for innovation, which was seized upon by Yoshiyuki Tomino in 1979 with the creation of Mobile Suit Gundam , a complex "space saga" that was called the " Star Wars of Japan" and birthed the real robot genre, which featured more realistic, gritty technology.  Tomino did not like the formulaic storylines and overt advertising of the super robot shows he had worked on, and wanted to create a movie where robots were used as tools.  While the response to Gundam was lukewarm at first, efforts by dedicated fans led to it becoming a success.  It created a massive market for mecha model robots, and became an industry that earned Bandai ¥42.8 billion in 2004.  Many real robot series and other media were later created, such as Full Metal Panic! and the video game series Armored Core . 
1990 saw the release of Patlabor , a breakthrough animated movie directed by Mamoru Oshii that popularized the mecha genre and aesthetic in the West.  Neon Genesis Evangelion , created by Hideaki Anno in 1995, was a major influence on the super robot genre, arriving when the real robot genre was dominant on television.  A deconstruction of classic mecha anime tropes, it recast the "saintly" inventor/father as a sinister figure, and the enthusiastic teenage protagonist as a "vacillating" introvert.  Due to its unusual psychological themes, the show became a massive success,  and further caused Japanese anime culture to spread widely and rapidly around the world. 
The mecha anime genre (as well as Japanese kaiju films) received a Western homage with the 2013 film Pacific Rim directed by Guillermo del Toro.  Similarly the genre was inspirational for the 1998 first-person shooter Shogo: Mobile Armor Division developed by Monolith Productions. 
Some of the first mecha featured in manga and anime were "super robots" (スーパーロボット sūpā robotto).  The super robot genre features superhero-like giant robots that are often one-of-a-kind and the product of an ancient civilization, aliens or a mad genius. These robots are usually piloted by Japanese teenagers via voice command or neural uplink, and are often powered by mystical or exotic energy sources.  Their abilities are described as "quasi-magical". 
The later real robot (リアルロボット riaru robotto) genre features robots that do not have mythical superpowers, but rather use largely conventional, albeit futuristic weapons and power sources, and are often mass-produced on a large scale for use in wars.  The real robot genre also tends to feature more complex characters with moral conflicts and personal problems.  The genre is therefore aimed primarily at young adults instead of children.  The genre has been compared to hard science fiction by its fanbase, and is strongly associated with sales of popular toy models such as Gunpla.
One of the "founding fathers" of real robot design was Kunio Okawara, who started out working on Gundam and continued on to other real robot series such as Armored Trooper Votoms . 
Mobile Suit Gundam (1979) is largely considered the first series to introduce the real robot concept and, along with The Super Dimension Fortress Macross (1982), would form the basis of what people would later call real robot anime.  In an interview with Yoshiyuki Tomino and other production crew members in the April 1989 issue of Newtype , about his views on the first Gundam anime that was not directed by him, he commented on the realism of the show, in which he sees the sponsors, Sunrise, as imaginary enemies of Gundam, since they did not accept a certain level of realism.  Armored Trooper Votoms is viewed by Famitsu magazine as the peak of real-robot anime. 
The concepts behind "real robots" that set it apart from previous robot anime are such as:
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This ubiquitous subgenre features mecha piloted internally as vehicles. The first series to feature such mecha was Go Nagai's Mazinger Z (1972). In a 2009 interview, Go Nagai claimed the idea came to mind when he was stuck in a traffic jam and wished his car could sprout arms and legs to walk over the cars in front.  Other examples include Mobile Suit Gundam (1979), The Super Dimension Fortress Macross (1982), and Tengen Toppa Gurren Lagann (2007). There are series that have piloted mecha that are also in the sentient category, usually because of an AI system to assist and care for the pilot, as featured in Blue Comet SPT Layzner (1985) and Gargantia on the Verdurous Planet (2013),  or going berserk because the mecha has biological aspects, as featured in Neon Genesis Evangelion (1995).
These are mecha that have the ability to be self-aware, think, and sometimes feel emotion. The source of sentience varies from aliens, such as the titular characters of American-produced and Japanese-animated series, The Transformers (1984), to artificial intelligence or synthetic intelligence, such as the robots of Dragon's Heaven (1988) & Brave Police J-Decker (1994) to magic, such as Da-Garn of The Brave Fighter of Legend Da-Garn (1992). The first series that featured a sentient giant robot, also the first mecha anime in color, was Astroganger (1972). 
These are mecha that are controlled externally. The first mecha anime, Tetsujin 28-go (1966), and Giant Robo (1967) are famous examples.
A transforming mech can transform between a standard vehicle (such as a fighter plane or transport truck) and a fighting mecha robot. The concept of transforming mecha was pioneered by Japanese mecha designer Shōji Kawamori in the early 1980s, when he created the Diaclone toy line in 1980 and then the Macross anime franchise in 1982. In North America, the Diaclone toy line was adapted into the Transformers franchise in 1984,  and then the Macross franchise was adapted into the Robotech franchise in 1985. Some of Kawamori's most iconic transforming mecha designs include the VF-1 Valkyrie from the Macross and Robotech franchises, and Optimus Prime (called Convoy in Japan) from the Transformers and Diaclone franchises. The concept later became more popular in the mid-1980s, with Macross: Do You Remember Love? (1984) and Zeta Gundam (1985) in Japan, and with Transformers (1984 adaptation of Diaclone) and Robotech (1985 adaptation of Macross) in the West.  
This refers to mecha that are powered exoskeletons rather than piloted as vehicles, such as in Genesis Climber MOSPEADA (1983), Bubblegum Crisis (1987) and Active Raid (2016); merge with the mecha, such as in Detonator Orgun (1991) & The King of Braves GaoGaiGar (1997); combine with the robots, such as in Transformers: Super-God Masterforce (1988); or become mechanical themselves, such as in Brave Command Dagwon (1996) and Fire Robo (2016).
Assembling and painting mecha scale model kits is a popular pastime among mecha enthusiasts. Like other models such as cars or airplanes, more advanced kits require much more intricate assembly. Lego mecha construction can present unique engineering challenges; the balancing act between a high range of motion, good structural stability, and aesthetic appeal can be difficult to manage. In 2006, the Lego Group released their own somewhat manga-inspired mecha line with the Lego Exo-Force series.
Mobile Suit Gundam, also known as First Gundam, Gundam 0079 or simply Gundam '79, is an anime television series, produced and animated by Nippon Sunrise. Created and directed by Yoshiyuki Tomino, it premiered in Japan on Nagoya Broadcasting Network and its affiliated ANN stations on April 7, 1979, and lasted until January 26, 1980, spanning 43 episodes. It was the first Gundam series, which has subsequently been adapted into numerous sequels and spin-offs. Set in the futuristic calendar year "Universal Century" 0079, the plot focuses on the war between the Principality of Zeon and the Earth Federation, with the latter unveiling a new giant robot known as the RX-78-2 Gundam piloted by the teenage civilian mechanic Amuro Ray.
The term mecha may refer to both scientific ideas and science-fiction genres that center on giant robots or machines (mechs) controlled by people. Mechas are typically depicted as humanoid walking vehicles. The term was first used in Japanese: 'mecha', after shortening the English loanword 'mechanism' or 'mechanical', but the meaning in Japanese is more inclusive, and 'robot' or 'giant robot' is the narrower term.
Gundam is a Japanese military fiction media franchise. Created by Yoshiyuki Tomino and Sunrise, the franchise features giant robots, or mecha, with the name "Gundam". The franchise began on April 7, 1979, with Mobile Suit Gundam, a TV series that defined the "real robot" mecha anime genre by featuring giant robots called mobile suits in a militaristic setting. The popularity of the series and its merchandise spawned a franchise that includes 50 TV series, films and OVAs as well as manga, novels and video games, along with a whole industry of plastic model kits known as Gunpla which makes up 90 percent of the Japanese character plastic-model market.
Bandai Namco Filmworks Inc., previously and still famously known as Sunrise, Inc., is a Japanese animation studio founded in September 1972 and is based in Suginami, Tokyo. Its former names were also Soeisha, Nippon Sunrise and Sunrise Studio.
Super Dimension Fortress Macross is an anime television series from 1982. According to story creator Shoji Kawamori, it depicts "a love triangle against the backdrop of great battles" during the first Human-alien war. It is the first part of two franchises: The Super Dimension trilogy and Macross series.
Yoshiyuki Tomino is a Japanese mecha anime creator, animator, director, screenwriter, songwriter and novelist best known for creating the Gundam anime franchise. He was born in Odawara, Kanagawa Prefecture, and studied at Nihon University's College of Art.
The Transformers is a line of mecha toys produced by Japanese company Takara and American toy company Hasbro. Initially a line of transforming mecha toys rebranded from Takara's Diaclone and Micro Change toy lines, it spawned the Transformers media franchise.
Macross is a Japanese science fiction mecha anime media franchise/media mix, created by Studio Nue and Artland in 1982. The franchise features a fictional history of Earth and the human race after the year 1999, as well as the history of humanoid civilization in the Milky Way. It consists of four TV series, four movies, six OVAs, one light novel, and five manga series, all sponsored by Big West Advertising, in addition to 40 video games set in the Macross universe, two crossover games, and a wide variety of physical merchandise.
Mobile Suit Victory Gundam, is a 1993 Japanese science fiction anime television series. It consists of 51 episodes, and was directed by Gundam creator Yoshiyuki Tomino. The series was first broadcast on TV Asahi. It is the fourth TV anime installment in the Gundam franchise, first series in the franchise released in Japan's Heisei period, and the final full series to be set in the Universal Century calendar.
In the fictional Macross Japanese anime series and its English adaptation Robotech, the first mass-produced transforming aerospace fighter mecha is called the VF-1 Valkyrie. The VF-1 Valkyrie is referred to as a "variable fighter" in Macross, but this is changed to the term "veritech fighter" in the Robotech series.
The RX-78-2 Gundam is a fictional manned robot (mecha), introduced in 1979 in Yoshiyuki Tomino's and Sunrise's anime series Mobile Suit Gundam. In the series, it is a prototype weapon for the Earth Federation when it falls into the hands of Amuro Ray, the son of its designer in story, who goes on to pilot it in the Earth Federation's war against the Principality of Zeon.
Diaclone is a toyline by Takara Toys launched in 1980. It consisted of transforming vehicles and robots piloted by miniature, magnet-shoed figures spun off from the prior Microman toy line.
Super Robot Wars, known in Japan as Super Robot Taisen, is a series of tactical role-playing video games produced by Bandai Namco Entertainment, formerly Banpresto. Starting out as a spinoff of the Compati Hero series, the main feature of the franchise is having a story that crosses over several popular mecha anime, manga and video games, allowing characters and mecha from different titles to team up or battle one another. The first game in the franchise was released for the Game Boy on April 20, 1991. Later spawning numerous games that were released on various consoles and handhelds. Due to the nature of crossover games and licensing involved, only a few games have been released outside Japan, and in English. The franchise celebrated its 25th anniversary in 2016, and its 30th anniversary in 2021.
Shōji Kawamori is a Japanese anime creator and producer, screenwriter, visual artist, and mecha designer. He is best known for creating the Macross mecha anime franchise and the Diaclone toyline, which were in turn the basis for the Robotech and Transformers franchises, respectively. He is also known for creating The Vision of Escaflowne anime series. He pioneered several innovative concepts in his works, such as transforming mecha and virtual idols. His work has had a significant impact on popular culture, both in Japan and internationally.
SD Gundam is a media franchise that spawned from the Gundam franchise. SD Gundam takes the mecha from Gundam and expresses them in super deformed and anthropomorphic style.
Kunio Okawara is a mechanical designer in the Japanese anime industry. Okawara was the first in the industry to be specifically credited as a mechanical designer. He designed mecha for the Gundam and Brave Series franchises, as well as those of numerous Super Robot and Real Robot shows.
Brain Powerd is a Japanese anime television series created by Yoshiyuki Tomino and produced by Sunrise. The series is set on a future, decimated Earth after the discovery of a mysterious, alien spacecraft dubbed "Orphan". A group of researchers scour the planet for Orphan's disc plates using mecha called "Antibodies" in order to revive the craft, an event that would result in the utter destruction of all lifeforms on Earth. The protagonists Yu Isami and Hime Utsumiya must utilize a special Antibody called "Brain Powerd" to counter the Orphan plans and save humanity. Brain Powerd was directed and written by Gundam creator Yoshiyuki Tomino. The series features mecha designs by Mamoru Nagano, character designs by Mutsumi Inomata, and music by Yoko Kanno.
Science fiction is an important genre of modern Japanese literature that has strongly influenced aspects of contemporary Japanese pop culture, including anime, manga, video games, tokusatsu, and cinema.
Studio Nue, Inc. is a Japanese design studio formed in 1972 by Naoyuki Kato, Kenichi Matsuzaki, Kazutaka Miyatake, and Haruka Takachiho. Crystal Art Studio would change their name to Studio Nue in 1974.
Space Gundam V is a South Korean animated film directed by Kim Cheong-gi, released on July 21, 1983. Despite its title, the series is not related to Mobile Suit Gundam. It is known for incorporating an unlicensed version of the VF-1J Valkyrie of Macross fame and the heroic elements of Brave Raideen.