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).