Brain

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, self-titled as the , or simply is a Roidmude commander who copied the appearance of . He later transformed into .
==History==
===Background===
Brain, originally designated as Roidmude 003, was among the first Roidmudes produced by Dr. Tenjuro Banno. When development for the Roidmudes hit a dead end, Krim Steinbelt provided Banno with the Core Driviars, enabling the Roidmudes to have the capacity to evolve. After Krim parted ways with Banno, the mad scientist proceeded to install negative human emotions into the Roidmude models, starting with the vacant bodies of 003 and 001. Vowing that their kind would evolve to surpass Banno and humanity itself, the Roidmudes killed their creators Banno and Krim after their awakening.
During Global Freeze, the 108 Roidmudes emerged and launched an attack on humanity which would be known as the Global Freeze, but were defeated by Protodrive. But at the midst of being weakened, he later infiltrated the intelligence agency and knocked out the programming deputy director Mitsuharu Kineta and assumed his human form. 003 proceeded in escaping through cyberspace, warning his brethren of the "Kamen Rider". Eventually, Brain, Heart, and Freeze defeated Protodrive. From there, he worked together with Freeze and Heart to experiment on Protodrive, stripping him of his memories and free will with the new persona known as Chase.
===The Roidmude Executive===
Six months following the Global Freeze, Brain accompanied Heart as the Roidmudes began to resurface and start another revolution against humanity. However, they encountered a new foe named, Shinnosuke Tomari, a police investigator for the Special Investigation Unit and the latest incarnation of Kamen Rider Drive. During the plight of the Crush Roidmude, Brain tried to poison his enemy but the latter survived.
When Mashin Chaser briefly allowed Drive to save the whole city from Volt Roidmude's blackout, Brain attempted to punish Chase but this unintentionally lead him to discover his number, along with regaining a small portion of his memories. Despite this setback, the actions of the Volt Roidmude allowed for Medic Roidmude's reawakening, who had gone comatose due to the strain of healing other Roidmudes during Global Freeze, much to Brain's disapointment.
===Advancing The Battle===
While Medic's resurgence causes Brain beginning to feel unnerved, he continues to keep his eyes on Chase. Once Chase's bike united with Kamen Rider Mach's bike to form the Ride Crosser, Brain finally revealed that Chase was previously Protodrive during the Global Freeze. While he tried to put an end to him, Brain was stopped by Heart who let Medic reboot Chase again to ensure his loyalty to the Roidmudes.
Brain insightfully manages to gather information of the Special Investigation Unit, figuring that Drive is among them. While he suggests to attack and expose Drive's identity, his plans were rejected by his colleagues as a cowardly act, making him questioning his place amoung them. Noticing Medic having risen up of correcting Chase's brainwashing and founding the Reaper Legion, caused Brain to envy her successes and gaining Heart's respect. He even went as far to even sabotaging her plans like weakening Chase's brainwashing, although he was caught and threatened by Medic if he tried to get in her way again.
===The Ultimate Evolution===
Eventually, Heart would reunite with Freeze as his comrade had unveiled the Neo-Viral Cores to make Roidmude evolution easier by having the Low-Class Roidmudes fuse with humans. Feeling bested by Medic at every turn, he begins to work with Freeze and infiltrated the police force as "Sou Noumi". He formulated a scheme to force Go Shijima to meet Freeze by showing him a tablet that contained something of value to Go. 
While Go's memories was altered by Freeze to make him into their trump card to defeat the Kamen Riders, until Go revealed that he is immune to the effect and manages steals Brain's tablet, revealed to containing Tenjuro Banno's consiousness. While Freeze would eventually become the first Roidmude to achieve a Over Evolved state, he was killed shortly after by Drive Type Tridoron.
Feeling further inadequate in his place with the Roidmudes, Brain later joins forces with Mitsuhide Nira into becoming a stronger Fusion Roidmude. This allows Brain to further evolve into his Over Evolved form and gain the high ground towards Medic, even gloating at her as he acchieved such state. He cooperates with Nira to frame the Special Investigation Unit under a conspiracy, only to be foiled once Shinnosuke Tomari gained the upper hand. While Over Evolved Brain fought against the Kamen Riders, he was no match against the trio and his body was destroyed. Although his Core survived, it was intercepted by Medic, who promised she would take very good care of Brain as she proceeded to torment him.
Due to their mutual disdain of each other, Medic put off restoring Brain's body and leaving him stuck as a Core following her for the time being. Despite his ordeal of being reduced to a Core, Brain's prior achievement of becoming Over Evolved as well as his surviving of his destruction in battle against the Kamen Riders made him destined to soon be restored and join the Promised Number, a collection of four Over Evolved Roidmudes, as revealed by Heart when he became the next to achieve Over Evolved.
===The Promised Number===
After regaining his body, Brain was forced to take care of a dog that belong to Medic's human template. However, he would witness Banno, having taken up a form of an evil Drive Driver. While a group of Roidmudes try to ambush him, the mad scientist swiftly defeats them. Brain was forced to bear witness Banno hijacking Roidmude 006's lifeless body to become Gold Drive. While he was caught by Gold Drive after the dog he took care of went loose, Banno sought to make use of him for his own Promised Number ceremony.
Since Heart refused to trust Banno, Brain was told by Heart to leave town while he still has a chance. But when Medic had acchieved Over Evolved state, Brain learnt how Banno reprogrammed her to serve him the moment she acchieved such evolution. While he felt bad for Heart for all the pain he is going through, he was more depressed with himself for seeing Medic in such a tragic state. While trying to escape from Banno, Brain learnt how much his personality was shaped too alike with his human template.
Brain would eventually give himself up to Banno, causing Heart to get livid for. Brain joined with Gold Drive, Heart, and Medic to transfer the energies from their Over Evolved forms to the Sigma Circular. While the Kamen Riders arrive to put a stop to the ritual, the device then proceeds to overload and siphons off its energy to Medic as Banno intended, causing Heart to grieve even more.
===Sacrifice And Death===
Once the Sigma Circular began to absorb Medic's energy, Brain finally revealed his true intentions and jump in to switch places with Medic. This act also allowed her reprogramming that stripped her will to be undone. However, Brain's body cannot handle the energy well, and is engulfed in a giant explosion that affects everyone in the vicinity. Heart and Medic reach over to Brain in his last moments. Brain is elated to see Medic restored back to normal and knowing Heart will regain his happiness again. They both held his hand and grasping onto his leg before Brain turns to dust with his core disintegrating not long after.
==Other Events==
 
===Kamen Rider × Kamen Rider Drive & Gaim: Movie War Full Throttle===
When Megahex invaded Zawame and had created Mecha Roidmude duplicates as his personal foot soldiers, this attracted the attention of Heart, Brain, and Chase. Upon arriving to the city, they greeted the Armored Riders and announced themselves as a group of individuals opposing Megahex. Heart transformed into his Advanced Roidmude state and fought alongside the Armored Riders against the Mecha Roidmudes right until Megahex's complete defeat, applauding the Kamen Riders for such victory.
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When Roidmude 089 ("Dr. Dee") hosted a brief alliance with the terrorist organization, Shocker, as well as from a parallel Earth, Brain took offense at 's rejection Heart's friendship, referring to the Roidmudes as 'mechanical puppets'. Medic told Brain to calm himself while Heart noted that from the humans' point of view themselves as Roidmudes would indeed appear to be monsters. Later on, Brain witnessed a charge past the window, to which he alerted Heart. With him and Medic missing the sight, Medic said Brain was being silly again while Heart suggested he get some rest, to which Brain figured that Heart was probably right as the rest of the ' set off to fight Kyuemon's Giant Roidmudes.
===Secret Mission Type TOKUJO===
While Shinnosuke Tomari was investigating Masahiko Odagiri's murder with the aid of Akira Kusakabe, a Superintendent of Tokyo Metropolitan Police Department, Brain eventually killed and copied Kusakabe. He used this identity to infiltrate the Special Investigation Unit. However, his purpose was be found and stopped by Shinnosuke Tomari.
===Kamen Rider Drive: Surprise Future===
When Shinnosuke was accused of property damage and wanted by the police, Chase arrived at the Roidmude hideout suspicious whether Heart, Brain, and Medic had anything to do with this. While they denied any wrongdoing, the Roidmudes confirmed that what was happening to Shinnosuke had nothing to do with the other brethren. However, they clued Chase in about one possible suspect.
===Drive Saga: Kamen Rider Chaser===
Brain eavesdropped Heart's conversation with Roidmude 099, now going by Angel. Realizing that she had a good point that the Roidmude population was dwindling, Brain initially agreed with her ideas to co-exist with humanity instead. While the other Roidmudes, including Brain, were open to listen to Angel's ideas, Heart was the only one who refused to listen to her words, especially when it was revealed that Angel's golden feathers were part of her plans to control every Roidmude. This caused Brain to change his mind at the last second. When Brain, Heart, and Chase narrowly escaped Angel's clutches, Heart's core was eventually absorbed into Angel. Chase went after Heart's core, while he took care of his Roidmude body, complementing that it had been a while since it was just the three of them. Fortunately, Heart's core was free after Kamen Rider Chaser defeated Angel. While he was comforted Heart, he was irritated once Medic returned in provocative clothes to impress Heart. Nevertheless, Brain was happy once Heart at least complemented him.
===Kamen Rider Drive: Final Stage===
Brain was revived by Roidmude 108 in the Final Stage. He later turned against Roidmude 108 and gain power from Shift Cars and transformed into Kamen Rider Drive Type Technic.
===Kamen Rider × Kamen Rider Ghost & Drive: Super Movie Wars Genesis===
Due to the "butterfly effect" of Shinnosuke Tomari and Takeru Tenkuji time travelling in 2005, Brain was revived alongside Heart and Medic. His trademark green jacket had turned black and the hair had turned into slightly darker perm hair. While the Roidmudes formed an alliance with Da Vinci Gamma to embark in world domination, Brain and the Roidmudes were finally erased after the timeline briefly restored back to normal.
===Drive Saga: Kamen Rider Heart===
Two years after the Banno's defeat, Brain and Medic were accidentally restored to life and inhabiting the same body with Heart. During the emergence of Roidmude 5886, Brain helped Heart to access the power of Drive. However, Brain could only manifest a feeble Drive Type Speed Wild Technic. During the second confrontation with 5886, Brain suggested that in order to unlock Heart's true potential as Kamen Rider, he and Medic needed to override the Drive Driver system, at the cost of their lives. Heart agreed on this and transformed into Kamen Rider Heart. After 5886 was defeated, their cores disintegrated. Before departing to the afterlife, Brain expressed that the next time they are revived, he would become a Kamen Rider.
===Kamen Rider Build: Be The One===
In an event witnessed by Sento Kiryu, Over Evolved Brain was among numerous monsters who engaged the eighteen Heisei Riders and is fighting against Kamen Rider Double before being wiped out by the Vortex Time Break of Kamen Rider Zi-O BuildArmor.
===Drive Saga: Kamen Rider Brain===
Following his second death where he mentioned he would become a Kamen Rider next time; Brain seemingly received such wish when the Mu organization reconstructed him for his 600 IQ. Before Mu's leader could erase his memories, a blackout happened, and Brain was saved by Crystal Peppler. He later found a mysterious Driver and as Mu prepared to execute Peppler for his apparent betrayal, Brain transformed into his Over Evolved state to fight them to no avail. Brain fell to his apparent demise, but miraculously transformed into Kamen Rider Brain. Brain managed to defeat most of the Mu members and escaped with Peppler on his motorcycle.
After being taken elsewhere safe, Peppler jokingly stated that he deliberately chose Brain because he was weak and did not want to risk making Mu even more powerful, and that rather than possessing an IQ of 600, he had 600 gigabytes of memory. While a stunned Brain processed this information, Peppler was recaptured by Mu's forces and got killed. Before he died, the professor revealed to Brain that Mu's ultimate goal was the destruction of individuality and explaining that this was the real reason he chose Brain to become a Kamen Rider. This motivated him to become Kamen Rider Brain once more and defeated Mu's forces before returning to the laboratory to confront Mu's leader. However, it was at this point where Brain woke up in a white datascape with Heart and Medic, revealing that these events were just a dream he was having while their data was being compiled by Go Shijima as part of his Neo Core Driviars Project.
===Zi-O: Over Quartzer===
Brain, as Kamen Rider Brain, was one of the Kamen Riders who appeared from the people's memories of Heisei Riders, during Sougo's battle against Kamen Rider Barlckxs. Brain helped defend the citizens from Barlckxs' invading forces.
=== KR Outsiders ===
Brain and Tenjuro Banno were revived by Ecole of Foundation X in new Humagear bodies using the Kamen Rider Chronicle Rider Gashat and a new unknown Bugvisor.
==Video game appearances==
===Kamen Rider Megaton Smash===
Brain appears as a boss in Kamen Rider Megaton Smash, among other villains.
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===Kamen Rider Riderbout===
Brain appears as a boss in Kamen Rider Riderbout, Brain is seen in the game in his Over Evolved Form
tumblr_nu2zcrbGhl1toeji8o1_1280.jpg|Brain as seen in Kamen Rider Riderbout
010.jpg|Brain Over Evoled as seen in Kamen Rider Riderbout
===Kamen Rider Buttobasoul===
Kamen Rider Brain is a playable character in Kamen Rider Buttobasoul.
==Personality==
As his name suggests, Brain is the most intelligent of the Roidmudes. However, he is arrogant and considers most other Roidmudes to have rude and ignorant personalities. Aside from his cold personality, he is also calculative, as shown when used a venomous neurotoxin powerful enough to kill Drive had he not been using the Mad Doctor Shift Car. He also has shown signs of being somewhat sadistic, as indicated by his laughter when pitting Mach against Drive and Chaser. Brain often uses sets of three adjectives to describe things.
Ironically, despite his brain motif and cool-headed outlook, he can easily become nervous whenever someone (particularly Medic) does a better job than him. This is displayed in several occasions, for example when Medic did a better job at reprogramming Chase by altering a portion of his base program, thus earning Heart's respect. This results in Brain developing a sense of jealousy towards Medic, and he constantly tries to find flaws in her personality in order to redeem himself and regain his comrade's respect. Brain's jealousy is further enhanced later after he synched with Mitsuhide Nira. Brain also has a habit of taking out his handkerchief whenever he becomes nervous. It is implied that he treasures his possessions a lot, and losing them would severely affect his emotions. When he sided with Gold Drive to manipulate Medic and caused her to become his puppet, Brain becomes troubled by his sense of guilt, especially when Heart was the person who was mostly affected by this. Combined with his determination to save Medic, Brain proved his devotion to Heart by sacrificing himself to save her, at the same time redeeming himself. Heart and Medic were heartbroken from this, while the Kamen Riders (including Go himself) became disgusted at Banno for causing Brain's death. 
According to Freeze, Brain's special emotion is "envy".
In Drive Saga: Kamen Rider Brain, Brain has shown a significant difference in personality. He no longer shows signs of malice as he had previously done, Brain even became joyous at being a Kamen Rider in his dream, to the point of cheerfully telling Heart and Medic as they were being revived by Go Shijima/Kamen Rider Mach.
==Forms==
==Equipment==
===Devices===
*Brain Driver - Belt-based transformation device, but its variant is similar to Banno Driver.
*Brain Brace - Bracelet-based device.
*Shift Cars - Gives access to Drive's forms and powers, depending on which car is used.
===Weapons===
*Brain Megane Blade - Kamen Rider Brain's personal weapon.
*Door-Ju - Drive's gun weapon.
===Vehicles===
*Ride Braiser - Kamen Rider Brain's personal motorcycle
==Behind the Scenes==
===Portrayal===
Brain is portrayed by . His suit actors are for Brain Roidmude and for Kamen Rider Brain. His suit actor in Kamen Rider Outsiders is . While disguised as Akira Kusakabe, he is portrayed by .
===Concept Art===
Brain was designed by .
Brain Roidmude concept art.jpg|Brain Roidmude concept art
Thief Roidmude concept art.jpg|Thief Roidmude concept art
===Etymology===
His human identity's name pronunciation Noumi Sou is a homonym of the Japanese word . "Mi" is also a part of , another way of pronouncing "3", which is Brain's original number designation.
===Drive Saga: Kamen Rider Brain===
In an April Fools' joke for 2017, the official Kamen Rider Drive Twitter announced a V-Cinema which will be released in 2035, throwing back to Brain's line about being the next to become a Kamen Rider at the end of Kamen Rider Heart. The joke post was made to commemorate the closure of the account. Two years later, however, it was confirmed that there will be a 2-part web series on . Shota Matsushima starred in this 2-part web series as Kamen Rider Brain.https://www.kamen-rider-official.com/news_articles/271松島庄汰主演「仮面ライダーブレン」本当に製作決定！脚本は三条陸、4月下旬配信
==Notes==
*In spite of his name and calm and collected nature at first, Brain later seems to have emotional outbursts when Medic gets close to Heart.
*Brain is the first Roidmude to attain all three Evolution States of Advanced Roidmudes.
*Most of the Kamen Rider games have provided relevant projects to commemorate Brain's death. These games include Kamen Rider Break Joker, Kamen Rider Storm Heroes, Kamen Rider Megaton Smash, and Kamen Rider Riderbout.
*Unlike previous green-colored generals, he didn't betray and murder his superior for power at all, instead, he remained loyal to most of his superiors, though he did betray Banno in the end, not for a selfish reason like most green-colored generals.
*Kamen Rider Brain's design is a recolored version of Protodrive and Gold Drive, but adding his cape, and his belt is similar to Banno Driver.
*According to the first part of the Kamen Rider Brain web series, Brain has an IQ of 600 which is equal to Takeshi Hongo.
**However, it was revealed by Crystal Peppler in the second part that this actually means his brain size is only 600 gigabytes, even smaller than a modern hard disk drive.
==Appearances==
==External Links==
*TV Asahi's page on Brain Roidmude
**TV Asahi's page on Super Evolution Brain Roidmude
*TV Asahi's page on Thief Roidmude
*Brain in Kamen Rider Official Website.
*Roidmude 003 in Kamen Rider Official Website.
*Brain Roidmude in Kamen Rider Official Website.
*Thief Roidmude in Kamen Rider Official Website.
*Brain Roidmude Over Evoled in Kamen Rider Official Website.
*Kamen Rider Brain in Kamen Rider Official Website.
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