Shiro Kazami

Shiro Kazami (風見 志郎, Kazami Shirō) was a 22-year-old college student at Jōnan University with a major in biochemistry. But by chance, he accidentally witnessed the brutal murder of a road worker by a member of the secret terrorist society known only as Destron, which appeared after the destruction of Gel-Shocker and continues its predecessor's goal of world domination.

To rid Destron of its witness, and taking no chances, they sent Scissors Jaguar to murder the entire Kazami family. Though he was forced to watch his family die before his eyes, Shiro was saved from the same grisly fate by the interference of Kamen Riders 1 and 2. Bent on revenge for his family's deaths, Shiro pleas the Kamen Riders to make him into a cyborg just like them. The two Kamen Riders refuse at first, but after Shiro was fatally wounded while saving them, the two had no choice but to respect his wishes.

As the Double Riders performed the operation, the Destron outpost is attacked and destroyed by Turtle Bazooka. The Double Riders were at a major disadvantage until Shiro joined the battle, now known as Kamen Rider V3. V3 went on to destroy his family's murderer while the Double Riders fought Bazooka Turtle, who now had a nuclear bomb in his body with intentions to destroy Tokyo. The Double Riders, feeling that Kazami is a worthy successor, take Turtle Bazooka away from the city just before the bomb explodes, leaving V3 to protect Japan on his own.

Across the series, Shiro battled Destron's cyborg monsters, eventually uncovering his newfound abilities while battling the likes of Doktor G, Baron Fang, and Archbishop Wing. When faced with Destron's strongest general, Marshal Armor, V3 was joined in his battle by ex-Destron scientist Jōji Yūki/Riderman and the Double Riders.

Eventually, V3 defeated the Destron Leader and departs on his motorcycle to parts unknown.