"BRAIN THE KAMEN RIDER!" Roidmude 003 (ロイミュード００３, Roimyūdo Zero Zero San), self-titled as the Brain Roidmude (ブレンロイミュード, Buren Roimyūdo), or simply Brain (ブレン, Buren) is a Roidmude commander who copied the appearance of Mitsuharu Kineta (杵田 光晴, Kineta Mitsuharu). He later transformed into Kamen Rider Brain (仮面ライダーブレン, Kamen Raidā Buren). 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. [Who Will Control Deadheat?] 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. [When Did Kyu Saijo Become a Roidmude?] Brain's jealousy is further enhanced later after he synched with Mitsuhide Nira.[Who Claimed the Life of Eisuke Tomari?] 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. [How Can I Use the F1 Body to Fight?] 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. [Who Loves Heart the Most?] According to Freeze, Brain's special emotion is "envy". In Drive Saga: Kamen Rider Brain, Brain has shown a significant difference in personality. He's no longer malicious as he previously was, 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. In Kamen Rider Outsiders, Brain is the only member of the Outsiders to have a moral compass compared to the others. He is perfectly capable of understanding right from wrong, being able to stop Yuto Sakurai from going down a dark path despite the circumstances of his timeline. And much like his sacrifice to protect Medic, he does the same act of self-sacrifice for Yuto's sake to bring him to the side of good.