Bio Hunter Silva (バイオハンター・シルバ Baio Hantā Shiruba) is a mechanical assassin created by the Anti-Bio Union during the Bio Civil War; after the planet's fall, he later becomes a major wild card in the battle between the Biomen and the Neo Empire Gear. His main objective is to track down and destroy any and all Bio Particles he comes across regardless of what it is or who or what possesses them. Later, he became the main antagonist of Kamen Rider × Super Sentai: Super Hero Taisen (in which he is named Rider Hunter Silva) and the leader of Dai-Zangyack.