Brainiac is a prominent member of SupermansRogues Gallery and one of the most iconic villains in comic book history.Created by writer Otto Binder and artist Al Pastino, Brainiac debuted in July 1958 as a green-skinned alien with advanced technology who attacked an Earth spaceship and possessed a private collection of shrunken, stolen cities, including the Kryptonian city of Kandor, which Superman stole back and took back to his Fortress of Solitude. Notably, Superman never actually managed to defeat the alien and was completely outmatched by his Deflector Shields and tirade of insults, and this was the Silver Age Superman, the same one who casually tugged chains of planets through space.He returned to menace the superhero over the years, sometimes and often in a Villain Team-Up with Lex Luthor. Due to legal issues, he was reimagined as a living supercomputer in humanoid form, the renegade agent of the Coluan race.Post-Crisis, he was reimagined again as an insane circus psychic named Milton Fine who believed he was possessed by an alien intelligence, though as that drew a Fan Backlash it was gradually implied that he might actually be Properly Paranoid and he began taking on genuinely alien characteristics, such as green skin and more audacious plans. Eventually this was all retconned and he was reimagined again as an evil alien robot, then as time went on his exact origins and nature as either a robot, a pure alien or an alien cyborg robot was Depending on the Writer. Once again, Superman receives (in different circumstances) a Kandor shrunk by Brainiac, this time apparently a holding city for non-Kryptonian residents of Krypton, in the interest of keeping Superman the Last of His Kind.In adaptations such as Superman: The Animated Series and its sequel Justice League, and later Smallville and Legion of Super Heroes, he was made into a living supercomputer with Kryptonian origins to create greater enmity with the Man of Steel. In the animated versions, Brainiac was given Fighting a Shadow qualities, the green-skinned humanoid being just one of many bodies used by the villain whose nature as a program means all of his technology is 'him' and he need only upload himself elsewhere upon physical "death." In the 2008 story arc Brainiac, this aspect of Brainiac became a Canon Immigrant and the various different versions Superman faced were retconned into probes themselves, and the true Brainiac was once again made into a Coluan cyborg. Once again he possessed Kandor (the one Superman had was "revealed" to be a fake), which again was a city full of Kryptonians. Upon finding out Superman was a Kryptonian, Brainiac set out to kill him and Supergirl, as the existence of Kryptonians outside of his bioshell threatened his control over their technology.Brainiac is a Legacy Character and there have been (or will be) at least 13 different incarnations of the character in the future, Brainiac 2 originally being a clone-son, though some of them are actually future, stronger versions of Brainiac himself. The most famous is the heroic Brainiac 5, The Smart Guy of the Legion Of Superheroes from the 31st century. In one Story Arc, the Brainiac 13 version from a Bad Future even fought Brainic 2.5, despite both being the same character. On most occasions, the ones who aren't actually Brainiac end up becoming the victim of his schemes.Fun fact: Brainiac is not, as you might think, named after a popular slang word for "intellectual." It's the other way around: that particular piece of slang actually started with him, and the writers of Superman are credited with coining it. So, yes, every time a bookish comic book fan gets mockingly called a "brainiac," his tormenters unknowingly pay tribute to DC Comics.
Aliens Are Bastards: Just read the page quote. It makes for a nice contrast with Superman's innocent alien; as one internet fan once said, the reason Brainiac is such an enduring villain is that he's the alien Superman isn't.
Arch-Enemy: One of Superman's chief foes, along with Lex Luthor and General Zod (Darkseid would qualify but he's more of a general DCU threat). After Luthor, he's probably the most iconic, the oldest, and easily one of the ones that Superman hates the most.
Big Bad: Competes with Luthor and Zod for the title of Superman's Biggest Bad, and has been the mastermind behind countless story arcs in both Superman's own book and the DCU at large (where, alongside the likes of Luthor and Darkseid he's one of the biggest bads around).
Characterization Marches On: With DC Comics' retconitis, who Brainy is never seems to remain constant for more than a few years at a time. Today's Brainiac is definitely a far cry from the day-one incarnation, who was basically "Alien!Lex Luthor" They teamed up a lot when they were basically the same character - a Dark Reprise of the Luthor-Brainiac teamup is Brainithor.
Deflector Shields: Perhaps theIconic Item associated with the Silver Age Brainiac was his force field belt, which even Superman couldn't break through. Most later versions of him have also possessed these in one form or another.
Demonic Possession: Of Lex Luthor, Milton Fine, Lena Luthor, Doomsday, and various others across his lengthy career.
The Dreaded: To Supergirl, who was on Krypton when Brainiac attacked and stole Kandor. The rest of the Kandorians are terrified of him as well, and General Zod views his failure to defeat the alien as his worst defeat.
Encyclopaedic Knowledge: Considering how many civilizations he's stolen knowledge from, it is not surprising that he possesses this.
Genius Bruiser: Even in his true form, he's roughly the equal of Superman and backs it up with far superior intelligence. When he possessed Doomsday, this became literally true as he was a genius in the hulking form of one of the physically strongest beings in the universe.
Go Mad from the Revelation: During the 80's, he believed there was a being called the "Master Programmer" conspiring to destroy Brainiac by sending his "angel of death", which is Superman.
Ingesting Knowledge: Nearly every version of Brainiac has had this ability, usually by interfacing with computers.
Joker Immunity: Even before the Fighting a Shadow retcon, he always came back, no matter how thoroughly his previous incarnation was destroyed. DC One Million revealed that a version of him had survived into the 853rd century.
Killer Robot: In the Silver Age and Bronze Age when he was a murderous android. The Modern Age saw him possess numerous robotic bodies before it they were retconned into being probes under the control of the actual alien.
Lack of Empathy: More like lack of any general emotion, making him all the more creepier.
Legacy Character: There have been at least 13 Brainiacs, roughly speaking each more powerful and advanced than the last, with 13 being so powerful he can conquer the Earth just by showing up and later very nearly destroyed and remade the entire universe. However, while the likes of 5 and 8 are distinct characters, quite often the different Braniacs' are just upgraded versions of the villain himself.
Lust: For knowledge. Brainiac wants to control all the information in the universe, and is prepared to slaughter billions to keep that information secret.
The Man Behind The Monsters/Robot Master: The most recent version of Brainiac has been revealed to a biological Coluan scientist and conqueror who has been fighting Superman for years using his robotic probes and psychic powers.
Manipulative Bastard: Oddly, some of his most successful manipulations are againsthimself, but he has still played several characters like pianos over his career, including highly intelligent ones like Superman and Lex Luthor.
Psychic Powers: When possessing Milton Fine, and to a degree even now.
Psycho Electro: Sometimes. As Brainiac 13, he jacked the entire Metropolis powergrid and attempted to electrocute Superman to death with it.
Really 700 Years Old: He was around when Krypton was still in one piece; this makes him several thousand years old at least.
Ret Canon: These days, as of the New 52, he's much like the Superman: The Animated Series version, which is also what most other adaptations' Brainiacs are based on. Apparently he still got started on Colu, but he also was the Kryptonian AI, and exists in many places under many names (including Earth, as the Internet.)
Robot Master: The Modern Age version of Brainiac was retconned into being an organic alien behind a horde of robotic probes.
Rubber-Forehead Aliens: In the stories where he's an actual Coluan, he basically looks human, just with green skin and no hair.
Shrink Ray: Owner and creator of one of the earliest in sci-fi literature.
Skele Bot 9000: Brainiac became skeletal in the Bronze Age, and in some Elseworlds stories, after experiencing a rebirth and absorbing all the knowledge the universe had to offer. His probes in Brainiac and New Krypton reference this.
Smug Snake: Sometimes. Brainiac is an incredibly competent Chessmaster (at times even better than Luthor), but is arrogant, and has great difficulty innovating or dealing with the unexpected. How well he handles this depends on the the writer.
Sore Loser: Brainiac would sooner blow up the planet than admit defeat.
Super Intelligence: A "12th level intellect", Brainiac may well be the most intelligent being in the DC Universe. He's certainly capable of storing and processing trillions of minds worth of information in his data banks and Coluan brain.
Super Strength: His robotic bodies have inevitably possessed this to one degree or another. The current version is an organic Coluan cyborg who can nevertheless mimic the powers of Kryptonians and other races, most notably, their strength.
Superior Species: Sees Coluans as superior to all other beings, and himself as superior to his fellow Coluans.
Technopath: One of his few consistent powers. Brainiac can inhabit and control most forms of technology, enabling him to assemble new bodies for himself with ease, and allowing him to arm himself more and more effectively. It also makes using any sort of technology against him an iffy proposition at best.
Time Travel: Brainiacs' 5, 8 and 13 have all traveled to the present from their respective futures for varying reasons, invariably involving the original.
Villain Team-Up: All the time with Luthor in the Silver and Bronze Ages, to the point where Luthor genuinely seemed to consider the robot a friend. This was entirely one-sided, as Brainiac's possession of Luthor in Whatever Happened to The Man of Tomorrow? would go on to demonstrate.
Villainous Breakdown: He's prone to doing this when he loses control of a situation, experiencing a spectacular one at the conclusion of Brainiac.
Well-Intentioned Extremist: The New 52 has tried to recreate Brainiac as one of these, out to save the universe from destruction by invaders from the 5th dimension. Whether this will stick, no one knows.
Writing Around Trademarks: A truly bizarre example - Edmund Berkely started selling a primitive rotary switch-based computer called the Brainiac a year before the character debuted in the comics, and when he expressed concern that the character would create confusion over the brand identity, DC actually retconned him into a computer rather than changing his name.
His name was inspired by a different computer anyway, so it's a bit less bizarre (or possibly more).