Yoshiki Takaya

A young man discovers a mechanical device that merges with his own body, turning him into a cyborg superhero... (imdb)

Sean Barker became the unwilling host to an alien bio-armor known as the Guyver. A year ago he destroyed the Kronos Corporation, an organization of mutants who want the Guyver. Now he is trying to find why the Guyver unit forces him to fight and kill evil. He is lead to an archelogical site where scientists discover an ancient space craft. Now he must fight Kronos again before they discover the secrets of the Guyver's origin. (imdb)

High school student Sho comes across a strange alien-like object that transforms him into a powerful living weapon called The Guyver. Hunted by a mysterious organization of shape-shifting monsters, Sho must now use his newly found power to save the people he cares about.

Masato, a seemingly typical high school student, has his life turned upside-down when he is suddenly arrested without explanation...He later learns that he had been selected to be the pilot for a giant fighting robot called the Zeorymer. His assignment is to fight Hau Dragon, the shadowy organization that built the Zeorymer, along with seven other robots they still control. (imdb)

Shou and his friend, Tetsurou, stumble upon a strange orb-like mechanism, the Guyver Unit, in the woods. It physically bonds with Shou and turns him into the alien soldier, Guyver. His mission is to protect the Guyver Unit from the Japanese corporation known as Chronos. They are after it and two other units just like it. To retrieve the object, they send out vicious monsters known as Zoanoids. So no one is safe in Shou's life; not even himself. (myanimelist.net)

Sho and his friend Tetsurou stumble upon an odd alien artifact while walking through the woods. Then, the alien artifact breaks free of its metallic bonds and enters Sho's body, turning him into the Guyver. With this new power, Sho must do battle with the evil Chronos corporation and their genetically enhanced Zoanoids, who seek to get the Guyver back into their labs. No one close to Sho is safe from Chronos. He must fight. (myanimelist.net)

Sho Fukamachi, a normal teenager accidentally found an alien object called Unit and thus, changed his life forever. The Unit bonded with Sho, resulting in an incredibly powerful life-form called Guyver. With this great power, Sho battles the mysterious Chronos organization and it's Zoanoids, in order to protect his friends and his world. Unknown to Sho, the battle against Chronos will lead to the discovery of the origins of human, their destiny, and the Creators... (myanimelist.net)