Orphenochs are fictional creatures from the Kamen Rider series, specifically introduced in Kamen Rider 555. They are humans who have been transformed by the Orphenoch virus, granting them superhuman abilities and unique powers. Each Orphenoch possesses distinct traits and abilities, often reflecting their original human characteristics. In the series, Orphenochs serve as antagonists, often battling the main character, Kamen Rider Faiz. Their existence raises questions about identity and humanity, as they struggle between their human past and their new, monstrous forms. The conflict between Orphenochs and Kamen Riders drives much of the series' plot.