Bio-Booster Armor Guyver or Guyver: The Bio-Boosted Armor (強殖装甲ガイバー, Kyōshoku Sōkō Gaibā?) is a long-running manga series written by Yoshiki Takaya. The Guyver itself is a symbiotic techno-organic (or biomechanoidial) device that exponentially enhances the capabilities of its host.