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I just like to see your face like this! This expression of you being jealous to me!
~ Brain teasing Medic after he became Super Evolved Roidmude anf defeated her; his most famous line.
As expected, I'm so capable, loyal... Capable, loyal, and...
~ Brain's final words after he sacrificed himself to save Medic.

The Brain Roidmude, originally designated as Roidmude 003, is the secondary antagonist in Kamen Rider Drive. He is one of the Roidmudes created by Tenjuro Banno and one of the leaders of their uprising against humanity. He assumes the human form of Sou Noumi to infiltrate the Metropolitan Police Department as a consultant. He at one point fuses with Mitsuhide Nira to become Thief Roidmude (II).

He was portrayed by Shota Matsuhima.


Roidmude 003 was among the initial trio of Roidmudes who murdered their creator, Dr. Banno. They then proceeded to the home of his colleague, Krim Steinbelt, who aided Banno in creating the Roidmudes with his Driviar Cores, to kill him as well. However, unbeknownst to the Roidmudes, Steinbelt's consciousness was uploaded into the Drive Driver upon his death by their hand.  

15 years later, all 108 Roidmudes emerged and launched an attack on human civilization which would be known as the Global Freeze. 003 was also the commander and part of the Roidmude onslaught in Tokyo which was stopped by the Shift Cars and Kamen Rider Protodrive. Both Brain, Heart, and Freeze acquired Proto-zero, the defeated Roidmude that sided with Krim Steinbelt and rebooted him (altered his memory as a result) as the Roidmude guardian Mashin Chaser.

Six months later, Brain and Heart remained in Japan to lead Roidmudes stationed in the country. After witnessing Proto-Zero/Protodrive's successor, Shinnosuke Tomari/Drive, Brain became aware of this enemy and for once, poisoned him although he survived. When Mashin Chaser briefly allowed Drive to save the whole city from Volt Ghost's blackout plan, Brain punished Chase but this unintentionally leads him to discover his number, as well as a small portion of his memories. As Chase and everyone wondered the mystery of the formation of Ride Crosser, Brain revealed that Chase had been Protodrive and finally tried to put an end to him until he was stopped by Heart who let Medic reboot Chase again. Witnessing the rebooted Chase's loyalty as a success, he decided to join in the battle until he was burnt alive by Mach Moerl.

Brain gives the other Roidmude commanders the data of the Special Investigation Unit. Figuring that Drive is among them, he planned to attack and/or expose Drive's civilian identity but all of them sarcastically reject it, rendering him nervous. Witnessing Medic's success had been rising up to the point of correcting Chase's brainwashing and founding the Reaper Legion. Envious of her success, Brain contemplated finding her weaknesses even to the point of sabotaging Chase after his remodeling by Medic via weakening his firewall. Though the strategy was a little success, Medic found out about the whole trick and threatened to eliminate him if he tried to get in her way again.

After being bested by Medic, he later aligns with Freeze, often calling him as "Teacher", and introduced himself to the police force as Sou Noumi. He later formulated a scheme, by convincing Go Shijima to meet 001 but declined. As he falls to the ground and seemed to get the upper hand by a desperate Kamen Rider Mach, the Roidmude suddenly took out his iPad, revealing a strange glowing blue screen for Go to see, turning him into the newest part of their faction. In fact, however, Go's memories were altered by 001 to make Go as their trump card in their plans upon to defeat the Kamen Riders, until Go revealed that he is immune to the effect and steals Brain's tablet to rescue his father.

Nira/Thief, with Brain in synchronization targets Yukari Karasawa, one of the eyewitnesses of Eisuke's death until the Kamen Riders rescue her though they did successfully manage to poison her. Nira and Brain later framed Shinnosuke for trying to take the lead of the Roidmudes and with Special Investigation Unit is backing him up. Though Shinnosuke escapes with the help of his friends, Nira/Thief faces him instead and nearly gets himself killed by Drive and Chase, had Brain not using his Super Evolve form. Brain left the injured Chase, telling the latter that he would be a part of a bigger plan that the Executives are constructing.

He is last seen as a number, indicating his Core, at the mercy of fellow Roidmude Medic, the latter of whom would later torture him for all the humiliation he's caused to the Roidmudes, with Heart plotting something about Dr. Banno.

His body was eventually restored by Medic and was set to become a part of Banno's Promised Number, but he was told to stay away from the mad scientist so Banno can never attain the Promised Number. He seemingly surrendered to a later brainwashed Medic after trying to connect to her, as he and his Roidmude cohorts power up Banno's Sigma Circular with their Super Evolved Core Driviars, but sacrificed himself to save Medic with his body and Core dissolving into nothingness afterward.


As his name suggests, Brain acted as the tactical leader of the team. He seemed to be the type that is of the "insufferable genius", as he is easily irritated, like how most of the evolved Roidmudes are, to him, those with a "rude" personality, preferring those that are loyal and wise like him. Aside from his cold personality, he is also calculative, as shown he could simply drip a venomous neurotoxin which powerful enough to kill Drive, had he not been using the Mad Doctor Shift Car.

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 on 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 constantly trying to find flaws in her personality in order to redeem himself and regain his comrade's respect. 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.

According to Freeze, Brain's special emotion is "envy".

He also has shown signs of being somewhat sadistic, if his laughter when pitting Mach against Drive and Chaser was any indication. Of course, this is similar to his human synch, Mitsuhide Nira due to both having huge jealousy for their rivals.



  • 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.
    • Additionally, Brain is similar to Kiyoto Maki from Kamen Rider OOO as they react very emotionally when something happens to one of their personal items. Brain breaks down when his handkerchief was burnt, whereas Maki freaks out and cannot speak properly when his puppet, Kiyo-chan, is removed from his arm.
  • Brain's tablet seems to be a heavily altered iPad.
  • Brain is the first Roidmude to attain all three Evolution States of Advanced Roidmudes.


           DriveOfficialLogo.png Villains

Executives: Freeze Roidmude | Heart Roidmude | Brain Roidmude | Medic Roidmude | Mashin Chaser | Roidmude 004 | Roidmude 006 | Gold Drive | Roidmude 089 | Revenger Roidmude | Angel Roidmude | Paradox Roidmude | Sigma Circular | Roidmude 5886
Advanced: Sword Roidmude | Tornado Roidmude | Paint Roidmude | Gunman Roidmude | Crush Roidmude | Volt Roidmude | Imitation Drive | Iron Roidmude | Voice Roidmude | Scooper Roidmude | Seeker Roidmude | Judge Roidmude | Open Roidmude | Cook Roidmude | Shoot Roidmude | Thief Roidmude | Cyberoid ZZZ
Reaper Legion: Roidmude 013 | Roidmude 015 | Roidmude 019 | Roidmude 021 | Roidmude 022 | Roidmude 028 | Roidmude 032 | Roidmude 034 | Roidmude 035 | Roidmude 041 | Roidmude 044 | Roidmude 045 | Roidmude 054 | Roidmude 059 | Roidmude 070 | Roidmude 075 | Roidmude 080 | Roidmude 081 | Roidmude 083 | Roidmude 092 | Roidmude 094 | Roidmude 100 | Roidmude 101 | Roidmude 104 | Roidmude 105
Cobra-Type Roidmudes: Roidmude 014 | Roidmude 031 | Roidmude 037 | Roidmude 038 | Roidmude 049 | Roidmude 052 | Roidmude 055 | Roidmude 057 | Roidmude 062 | Roidmude 063 | Roidmude 073 | Roidmude 074 | Roidmude 082 | Roidmude 085 | Roidmude 086
Spider-Type Roidmudes: Roidmude 012 | Roidmude 018 | Roidmude 020 | Roidmude 025 | Roidmude 036 | Roidmude 039 | Roidmude 042 | Roidmude 046 | Roidmude 047 | Roidmude 056 | Roidmude 060 | Roidmude 064 | Roidmude 078 | Roidmude 079 | Roidmude 084 | Roidmude 093 | Roidmude 097 | Roidmude 102
Bat-Type Roidmudes: Roidmude 011 | Roidmude 016 | Roidmude 026 | Roidmude 040 | Roidmude 048 | Roidmude 051 | Roidmude 053 | Roidmude 061 | Roidmude 066 | Roidmude 068 | Roidmude 069 | Roidmude 071 | Roidmude 076 | Roidmude 077 | Roidmude 087 | Roidmude 088 | Roidmude 095 | Roidmude 096 | Roidmude 098 | Roidmude 103 | Roidmude 107
Other: Lost Number Roidmudes | Future Roidmudes

Hajime Taga | Itsuro Negishi | Koichi Sakaki | Koya Nishihori | Kisaburo Sasamoto | Makoto Asamura | Matsutaro Okumura | Mitsuhide Nira | Reiko Nishihori | Shunsuke Kusaka | Takuro Mogi | Tenjuro Banno | Zoruku Tojo

Keisuke Okamura | Roidmude 012 | Roidmude 055

Great Leader of Shocker | Kyoichiro Kuroi | Kamen Rider 4 | Roidmude 089 | Hiruchameleon | Turtle Bazooka | Roidmude 016 | Roidmude 057 | Roidmude 076 | Arimammoth | Cheetahkatatsumeri | Kamen Rider Ouja | Kamen Rider Sasword | Kamen Rider Dark Kiva | Kamen Rider Baron

Kibaoni Army Corps
Kyuemon Izayoi | Hitokarage

Leader of Mu | Oogumo Great Leader | Cancer Zodiarts | Gremlin | Demushu | Gamma Superior | Guren Graphite | Kamen Rider Dark Kiva | Kamen Rider Wiseman | Kamen Rider Poseidon | Kamen Rider Duke | Kamen Rider Dark Ghost | Kamen Rider Another Para-DX

Megahex Collective
ZZZ Megahex | Mecha-Kaito Kumon | Lost Number Roidmudes

Da Vinci Gamma | Michelangelo Gamma | Raffaello Gamma | Gamma A

           Ninningerlogo.png Villains

Kibaoni Army Corps
Gengetsu Kibaoni | Kyuemon Izayoi | Raizo Gabi | Masakage Tsugomori | Ariake no Kata | Mangetsu Kibaoni | Juza Yumihari
Yokai: Yokai Kamaitachi | Yokai Kappa | Yokai Kasha | Yokai Tsuchigumo | Yokai Ungaikyo | Yokai Buruburu | Yokai Tengu | Yokai Nekomata | Yokai Ittan-momen | Yokai Daidarabotchi | Yokai Enraenra | Yokai Yamawarawa | Yokai Yamabiko | Yokai Futakuchi-onna | Yokai Kasabake | Yokai Umibozu | Yokai Otoroshi | Yokai Baku | Yokai Nurikabe | Yokai Yuki-Onna | Yokai Mataneko | Yokai Mokumokuren | Yokai Amikiri | Yokai Fudagaeshi | Yokai Wanyūdō
Advanced Yokai: Advanced Yokai Nue | Advanced Yokai Konakijiji | Advanced Yokai Oumukade | Advanced Yokai Oboroguruma | Advanced Yokai Binbogami
Western Yokai: Western Yokai Franken | Western Yokai Dracula | Western Yokai Wolf Man
Super Advanced Yokai: Super Advanced Yokai Shuten-douji
Soldiers: Hitokarage | Giant Yokai Gashadokuro | Jukkarage | Hyakkarage

Izayoi Way Ninja Army Corps
Kyuemon Izayoi | Karakuri Kyuubi
Disciples: Speed Ninja Hayabusa | Sugoroku Ninja Ikkakusai | Puppet Ninja Kuroari | Substitution Ninja Mujina | Poison Arrow Ninja Suzumebachi
Soldiers: Genin Supparage

Great Leader of Shocker | Kyoichiro Kuroi | Roidmude 089/Doctor D | Hiruchameleon | Turtle Bazooka

Heart Roidmude | Brain Roidmude | Medic Roidmude | Roidmude 016 | Roidmude 057 | Roidmude 076