Ryoma Sengoku/Kamen Rider Duke

Ryoma Sengoku (戦極 凌馬 Sengoku Ryōma), refered to as Professor Ryoma (プロフェッサー凌馬 Purofessā Ryōma), was the creator of the Sengoku Driver and the Genesis Driver. He worked under Takatora Kureshima, his closest friend to stop Helheim's invasion. However, after a conversation gone awry with Takatora, Ryoma secretly plans a coup against him. Ryoma Sengoku initially transformed as Kamen Rider Duke (仮面ライダーデューク Kamen Raidā Dyūku) using a Sengoku Driver. He later upgrades himself along with Takatora using the Genesis Driver and the Lemon Energy Lockseed in place of his regular Lemon Lockseed. Further upgrades were then given to Genesis Driver to allow him to combat the weaker Over Lords with relative ease as well with additional functionality.