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Anime & Manga
- Dr. Gero from Dragon Ball Z.
- 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.
- Justice League of America's Dr. T.O. Morrow.
- 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.
- Tyranik from Archie Comics's ManTech series.
- 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, and also introduces the doctor's old assistant, Ygor.note
- House of Frankenstein has Dr. Neimann, implied to be Ygor's brother.
- Young Frankenstein has the doc's descendent, Dr. Frederick "Frahnkensteen."
- 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.
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.
- 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.
- 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.
- The Quintessons from The Transformers.
- Ming's flunky Dr. Tav from the 1970's 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.
- Transformers Animated's Isaac Sumdac, who reverse engineered technology from Megatron's head, resulting in Detroit being a center of robot production.
- 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.