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- Dr. Gero from Dragon Ball Z made many robots to fight Goku, though some of them are cyborgs (17, 18, and himself) or artificial lifeforms (Cell).
- Dr. Vegapunk of One Piece. This may change later on, as he's pretty much stated to have a whole plethora of other accomplishments under his belt, but his most prominent role in the story thus far is creating a small army of Pacifistas for the World Government.
- Jail Scaglietti from Lyrical Nanoha. He also builds cyborgs.
- Winry of Fullmetal Alchemist is constantly repairing robotic limbs and such.
- All Incarnations of Dr. Hell from the Mazinger series are this to varying degrees.
- Dr. Rotwang from Tiger & Bunny.
- Engineer Sakaki from Patlabor.
- Doctor Tenma and Doctor Ochanomizu from Astro Boy.
- Doll by Mitsukazu Mihara is an anthology series about humans interacting with robots, so it's only natural that many of its characters are robot specialists.
- Norman Burg in The Big O knows how to maintain a megadeus — though being an amnesiac like everyone his age in Paradigm City, he doesn't remember how he learned this skill. He repairs and maintains the Big O for Roger.
- Dr. Will Magnus, creator of the Metal Men.
- The Mad Thinker from Fantastic Four.
- Toyman from Superman can build lifelike androids, but prefers to make his killer robots look like toys.
- Justice League of America's Dr. T.O. Morrow, creator of Red Tornado, Amazo, Tomorrow Woman, and assorted other bots. They tend to rebel on him, but since he's evil, that's usually a good thing.
- Alistaire Smythe, creator of the Spider-Slayers.
- Also minor Spidey antagonists Armada and Future Max.
- And minor character Mendel Stromm, who actually calls himself "Robot Master".
- Dr. Abel Stack, who built Aaron Stack the Machine Man. He also helped build all the previous robots in Aaron's series, who all went mad. The reason Aaron turned out all right is that Abel actually raised him as a son.
- Bolivar Trask, creator of the X-Men's robot nemeses, the Sentinels.
- The (possible) Trope Namer from Marvel's The Transformers comic is actually an invocation of this trope: failing comic-book writer Donny Finkelberg is enlisted by the government to pose as the "Robot Master" and make threatening speeches on TV taking responsibility for the Decepticons' actions, to keep the population from panicking. Hilarity Ensues when the 'cons found out that some dumb squishy was pretending to be their master. In fact, when Megatron awakens, he decides to keep Finkleberg around to continue the charade, since he could make it look like all robots are under his control, making it harder for the Autobots to enlist human allies. It doesn't quite work in the long run, since it's kind of hard to explain why one guy would have two sets of robots fighting each other, but it becomes moot when Finkleberg manages to escape.
- Despite being a robot himself, Ultron would certainly count. He built The Vision, Jocasta, Victorius,and Alkhema, as well as countless duplicates of himself—usually just replacement bodies for when he inevitably gets destroyed at the end of each appearance, but he has built armies of these duplicates on a couple of occasions (with the predictable Conservation of Ninjutsu in full effect).
- The Followers of the Light from Marvel's Shogun Warriors comic are aliens who built the titular humongous mecha to fight giant monsters.
- Tyranik from Archie Comics's ManTech series was driven mad by the same ancient "knowledge ray" that taught him about robotics, so he wants to wipe out mankind and replace it with robots.
- The Katayanagi twins from the Scott Pilgrim series, though the building itself happens off-screen. In the comics, anyway; the film changed them to techno-themed Musical Assassins
- Baxter Stockman from the original Teenage Mutant Ninja Turtles comics is a computer expert who builds small "Mouser" robots and uses them to commit crimes.
- The Assemblyman from Astro City.
- Dr. Totenkopf in Sky Captain and the World of Tomorrow.
- Sebastian in Blade Runner. "They're just toys, really..."
- Gene Simmons' Dr. Luther from Runaway not only builds killer drones, he also sabotages existing household robots so they'll go berserk on command.
- The original Dr. Frankenstein (named Victor or Henry) comes from the novel, but the Expanded Universe of the movies gives him various relatives and assistants to carry on his legacy.
- Bride of Frankenstein introduces his sinister old mentor, Dr. Pretorius.
- Son of Frankenstein is Exactly What It Says on the Tin with the doctor's son, Wolf Frankenstein, and also introduces the doctor's old assistant, Ygor.note
- The Ghost of Frankenstein introduces the doc's other son, Ludwig.
- House of Frankenstein has Dr. Neimann, implied to be Ygor's brother. And he has his own hunchbacked assistant!
- Young Frankenstein has the doc's descendent, Dr. Frederick "Frahnkensteen," and his hunchbacked assistant, Igor (pronounced EYE-gor).
- SkyNet from Terminator builds its own troops.
- The film version of Tony Stark is portrayed as one. While he prefers to build high-tech armor for himself, he has also programmed complex AIs such as JARVIS and keeps a couple of robotic arms that he built as a kid as his pets. This escalates in Iron Man 3 when he has JARVIS take control of his extra suits; and then in Avengers: Age of Ultron he has a set of autonomous "Iron Legion" bots and is a major factor in creating both Ultron and Vision.
- Nathan from Ex Machina.
- Isaac Asimov's Dr. Susan Calvin (from I, Robot) is a robo-psychologist.
- Victor Frankenstein, although he only ever got around to building one and a half androids (two, in the film sequel.)
- Doctor Impossible, from Soon I Will Be Invincible, uses a wide variety of tech but specialises in robots and doomsday devices.
- Dr. Emil Lang from Robotech is the world's leading authority on Robotechnology. "Robotechnology" actually refers to all types of alien-derived technology on Earth, but the most visible type is all the Humongous Mecha running around. He eventually succeeds in building a sentient android, Janice Em. Lang is a major character in the Robotech novels and comics, although he only has a couple of brief cameos in the original TV series.
- Adam Link's "father," Dr. Link.
Live Action TV
- Lord Dread from Captain Power and the Soldiers of the Future took over the world with robots.
- Dr. Franklin from The Six Million Dollar Man and The Bionic Woman, who created an army of fembots.
- Dr. Noonian Soong, creator of Data, Lore, and B4.
- Grant Imahara on Mythbusters.
- The Mad Scientist in "Cybernauts" episode of The Avengers builds two robots, which Steed foils by getting them to destroy each other.
- Buffy the Vampire Slayer. Warren built the April-bot, the Buffy-bot, and finally a robot of himself. Willow shows herself to be quite good at fixing/reprogramming the Buffy-bot when needed.
- In season 9, Andrew uses Warren's lab to create another Buffy-bot and switches it's consciousness with the real Buffy.
- Wonder Woman: "The Deadly Toys" features Frank Gorshin of the Riddler fame from Adam West's Batman as an evil toymaker. His plan includes making a robot Wonder Woman to challenge the real Amazon Princess.
Manhwa and Korean Animation
- The human cast of Cubix: Robots for Everyone.
- Robot Gladiators supplement. Dr. Anton Wolcott, Chief Roboticist of the Interstellar Gladiator Authority.
- Mechanon probably counts: as a robot, he used automated factories to make improved versions of himself.
- Evil Sorcerer variant: Xin, the High King of ancient Thassilon in Pathfinder, was enamored with powerful clockwork automatons, and in fact was entombed in a "living" clockwork sarcophagus.
- House Ardoc in the city of Kaer Maga specializes in animating golems and other magical constructs.
- The wizard Trioband in Forgotten Realms, who created various specialized metal automatons.
- In Sentinels of the Multiverse, the villain Omnitron builds Drones to fight the heroes, while the hero Unity creates mechanical golems that do her fighting for her.
- Magic: The Gathering: Both of Tezzeret's planeswalker cards have abilities that search the player's deck for artifacts and turn them into powerful creatures.
- The owner and employees of Rossum's Universal Robots in Karel Capek's play "R.U.R.," which famously coined the word "robot."
- Though only the first film would retain the name Fritz (later films renamed him Ygor or Igor), Dr. Frankenstein's hunchbacked assistant Fritz actually dates back to early 19th century stage adaptations of Mary Shelley's novel.
- Dr. Wily and Dr. Light from the Mega Man games, whose main robots are coincidentally known as Robot Masters.
- Sonic the Hedgehog's diabolical Doctor Robotnik, whose portfolio includes trying to turn everyone in the world into a robot.
- Lord Agony from Lock's Quest.
- In Professor Layton and the Curious Village, we have Bruno, who built ALL of the inhabitants of St. Mystere with the exception of the late Baron Reinhold's daughter, Flora
- Purge from Space Channel 5 Part 2 makes hundreds of robots to face off against Ulala. Apparently he's so talented, he mass-produced the Peace Carrier 8 times in under a day.
- Robotics Masterminds in City of Heroes/Villains are playable robot masters.
- Gaige the Mechromancer and her Killer Robot / Science Fair project D374-TP a.k.a. "Deathtrap" from Borderlands 2.
- In theory, this is 0's job in Big MT in Fallout: New Vegas Old World Blues. In practice, while he's not too bad at the mechanical side of things (his modification of RobCo's Securitrons are more powerful, despite having been in the open seemingly without maintenance for centuries), his software skills are... not quite up to the task (his robots either a) have gone berserk or b) hates their job). Mr. House of New Vegas has elements of this himself — while his skills extended quite a bit beyond robots, it was a major focus of him and the company he created, RobCo, and in the modern day his influence on the outside world mainly occurs through controlled and sometimes modified Securitrons.
- The Mechanist in Fallout 4 is an expert of robotics and has an army of robot for terrorizing the Commonwealth and killing everything coming across their path, complete with a factory as the lair to mass produce the robots. You can become one after acquiring the Robot Workshop as well.
- Lightspeakers from Nexus Clash are fragile, cheerful angels devoted to defending justice and protecting the innocent by building and maintaining an army of relentless robotic minions. They're much more positive than most examples of this trope, but their armies can be incredibly dangerous if they fall prone to the Black and White Insanity that often tempts angels in the Nexus.
- The Elder Scrolls
- In the series' backstory, the extinct Dwemer were masters at creating mechanical "animunculi", ranging from miniature spider centurion workers to sphere and steam centurion soldiers to full blown Humongous Mecha. As the Dwemer were known to tinker with the "earthbones" (essentially the laws of physics and nature in the ES universe), they could make their creations impervious to wear and tear, meaning that many are still up and running even thousands of years after their disappearance.
- Edwinna Elbert, Stewardess of the Ald-Ruhn Mages Guild, studies Dwemer creations. If one brings her a copy of a certain rare book, she'll mention how she wants to be one of these, believing it will make her famous.
- In the Tribunal expansion, one can meet Ignatius Flaccus in Mournhold. Ignatius spends his time restoring Dwemer centurions to use as combatants in his robot arena. Of course, he quickly learns the hard way that Dwemer creations tend to behave erratically if taken outside of Dwemer ruins.
- Agatha Heterodyne of Girl Genius.
- In Homestuck the Troll Equius Zahhak is quite skilled at building robots and cybernetic limbs. He does this so that he can blow off steam by fighting killer robots.
- Rika, a British example from RPG World
- In The Adventures of Dr. McNinja, Sean "Dark Smoke Puncher" McNinja likes to build robot animals with laser vision and stuff. Their main job is to guard the family home, but that's just an excuse—he just likes making the suckers.
- Molly from The Inexplicable Adventures of Bob! builds lots of robots, mostly for fun. Only one of them has turned out sentient - the one made out of a milking machine. Two of the others were made of snow; and of those, one could transform into a giant ice ballista. Yes.
- Doctor Steel, creating an army of giant robots, and having a robot band. And a lot of robot toys.
- Jack Spicer from Xiaolin Showdown uses a wide array of robots in addition to the series's magical MacGuffins.
- The Quintessons from The Transformers.
- The supercomputer TORQ-III from the episode "Day Of the Machines" is described as a "machine that can build other machines." When Megatron reprograms TORQ to be hostile, TORQ commands all of the robots he's built to go on a rampage.
- Any of the "medic" characters, like Ratchet or First Aid, would qualify for "maintaining" robots. As Mechanical Life Forms, they just think of it in different terms. Wreck-Gar and Alpha Trion would probably count, too.
- Dr. Fujiyama, creator of Nightbird the robot ninja.
- Transformers Animated's Isaac Sumdac, who reverse engineered technology from Megatron's head, resulting in Detroit being a center of robot production.
- Ming's flunky Dr. Tav from the 1970s Flash Gordon cartoon. Dr. Tav invented Ming's army of Mecha-Mooks.
- Though he has many other accomplishments, Dexter from Dexter's Laboratory is constantly building robots.
- Tobey from WordGirl, with his mega-giant-attack robots.
- Dr. Von Richter from Cybersix specialized in biological androids.
- DuckTales: Gyro Gearloose. After one disaster, Scrooge McDuck specifically forbade Gyro from making robots, because A.I. Is a Crapshoot. At least once Gyro attempted to get around this restriction by building piloted robots to get around the restriction, and rather than causing mayhem on it's own, the Beagle Boys simply stole them and caused mayhem anyway.
- Ziv Zoolander from the appropriately titled The BOTS Master.
- In Bolts And Blip, all the robots on the Moon were built by Dr. Tommy, except the evil Mecha-Mooks who were built by Dr. Blood.
- Nora Wakeman, Jenny's "Mom" from from ''My Life as a Teenage Robot."
- Dr. Nightmare, a Space Ghost villain who built Mechanical Monsters.
- Kaeloo: Olaf the emperor penguin has his own robot, which he uses to get anyhing he wants or needs. He also once turned Stumpy into a cyborg, and he built a robot army in the second season finale.