Bio-Booster Armor Guyver (Viz Media) or Guyver (Chuang Yi Publishing)(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 biomechanical) device that enhances the capabilities of its host.