Brain

"Why do only the most rude and unruly troublemakers seem to evolve?"

- Brain's complaints on evolved Roidmudes

The Brain Roidmude (ブレンロイミュード), known simply as Brain (ブレン), also as known as Roidmude 003 (ロイミュード００３), is one of the commanders of the Roidmudes. He is later named by Mitsuhide Nira as Mr. Noumi, consultant from Paranormal Science Institute.

Character History
Roidmude 003 was among the three initial trio of Roidmudes 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 and Heart acquired Proto-zero, the defeated Roidmude that sided with Krim Steinbelt and rebooted him 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 altough 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 risen up to the point of correcting Chase's brainwashing and founding the Reaper Legion. Envious of her success, Brain contemplated to find 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.

Personality
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.

"I must redeem myself by any means necessary! How dare there be someone more useful to Heart than me?! Damn you Medic!"

- Brain gets nervous.

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 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 handkerchief a lot, as seen when Medic threw it into the fireplace causing him to break down in nervousness and scream loudly.

Portrayal
Brain is portrayed by Shota Matsushima (松島 庄汰). As Brain Roidmude, his suit actor is Daisuke Satō (佐藤 太輔).

Appearance

 * Kamen Rider Drive
 * Episode 2: What is a Kamen Rider?
 * Episode 3: Who Stole the Woman's Smile?
 * Episode 4: What is That Prideful Chaser Thinking?
 * Episode 5: What Are the Steel Robbers After?
 * Episode 6: Who Does the Warrior Fight For?
 * Episode 7: How Was That Decisive Moment Captured?
 * Episode 8: What is the Secret That Dwells in the Heart?
 * Episode 9: How Can I Get Used to the Cool Body?
 * Episode 10: What Is in the Belt's Past?
 * Episode 11: Who Can Prevent the Dark Christmas Eve?
 * Episode 0: Countdown to Global Freeze
 * Secret Mission Type TV-KUN: Hunter & Monster! Chase The Mystery of The Super Thief!
 * Kamen Rider × Kamen Rider Drive & Gaim: Movie War Full Throttle