He is a motorcycle-riding superhero modeled upon a hybrid of a grasshopper as well as a dragonfly and armed with a variety of powers. His name is a pun on Version Three as he is the 3rd Kamen Rider and therefore Kamen Rider 3.
He was a 22-year-old college student who was the junior of Hongo at Jounan 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. After Kazami nearly got murdered by Destron's agents, Hongo decided to keep a close eye to protect him.
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. After Hongo and Ichimonji sadly realized what their mistakes have cost, they decide to stop Destron. 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, they saw the good in his heart and had no choice but to turn him into a cyborg to save him.
As the Double Riders performed the operation and added a portion of their powers to Kazami, the Destron outpost is attacked and destroyed by Turtle Bazooka. The Double Riders were presumably temporarily weakened by adding their powers to Kazami which put them on 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 shout this predecessors names as they speak to him via telepathy to assure him. After seeing his two predecessors seemingly sacrifice themselves to save the people of Tokyo, Kazami then decides to fight Destron to save others rather then for revenge.
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 Joji Yuki/Riderman and the Double Riders. Eventually, V3 defeated the Destron Leader and departs on his motorcycle to parts unknown.
Shiro Kazami returned to Japan after some time traveling around the world. He decides to visit Tobei Tachibana, only to arrive while he's talking about the Riders to a group of children. A man badmouthing the Riders gets into a fight with Tachibana, only for Keisuke Jin to arrive, revealing that the man badmouthing the Riders was an agent of the organization Government of Darkness.
The man reveals his true form, the myth monster Neptune, and attacks Tachibana alongside Medusa and Chimera, all three who had been revived and wanted revenged against X. Shiro Kazami finally reveals himself, excited to fight against another evil organization after Destron. Fighting as V3 alongside X, he easily destroys Chimera and helps X finish off the other two. Afterwards, King Dark challenges X to continue stopping his plans, and Shiro Kazami decides to stay and join the fight against G.O.D. Special Edition, Full Force of Five Riders!!
G.O.D.'s forces attack various points of Tokyo, meanwhile, to fight against his threat, the previous four Riders return from various points of the globe. V3 comes from Moscow and Riderman, who's shown alive for the first time since his death, reveals that he had been in Tahiti. The 5 Riders, following one of the Franken Bat's bat spies head to one of G.O.D's bases. V3 faces Icarus, Cerberus, Neptune and Chronos before regrouping with the other Riders, when he took on and destroyed Icarus and Neptune.
Afterwards, the five Riders face Franken Bat. The four Riders helped X execute the "Rider Super High Kick" technique, destroying Franken Bat. They invaded a G.O.D. base and faced King Dark, but the entire complex was merely an illusion, which disappeared while King Dark laughed at them. Five Riders vs. King Dark
Some time later, X was captured and had his energy absorbed by G.O.D.'s villain monster Spider-Napoleon. At the last moment, V3 appeared and challenged him to a battle, only to disappear, escaping with X. Keisuke Jin's life was in danger, and his power wasn't enough to face his opponent, to help the fellow Rider, V3 decided to give him the Mercury Circuit (マーキュリー回路, Mercury Circuit?), which could greatly power up X. However, V3 needed to transfer a large amount of his blood to him in the process, weakening himself.
Spider-Napoleon soon attacked again, forcing V3 into action before he had recovered. V3 managed to rescue his hostages, but was overwhelmed by Spider-Napoleon and the rebuilt Mach Achilles and Salamander-Gong. He was rescued by the powered up X, who finished off Spider-Napoleon, while V3, even weakened, beat Mach Achilles and Salamander-Gong together. Look! X-Rider's Great Transformation!!
Later, X was caught into a trap by Leech Dracula, alongside two hostages, but in the last moment he was rescued by V3 riding X's own Cruiser bike. When Tobei Tachibana was captured by Leech Dracula, it was Kamen Rider 2, Ichimonji Hayato's time to appear and save Tobei. While X remained to face Leech Dracula, Rider 2 and V3 went ahead to stop King Dark at once, however, Kind Dark easily sealed the path to him, avoiding facing them. Fear! King Dark's Revenge!!
X would later be defeated and captured by the villain monster Tiger Nero, who wanted the plans for the RS Mechanism, which G.O.D. would use to create a powerful weapon, in exchange for his rescue. Tobei Tachibana gave the plans, only to be captured too, but he had also called Shiro Kazami, who transformed into V3 and saved them. However, they were unable to recover the plans.
In a later encounter, when Tiger Nero attempted to use the newly built weapon against them, however, it turns out that one of G.O.D.'s scientists was actually Ichimonji Hayato, who sabotaged the experiment. The three Riders fighting together stopped Nero, only to be challenged by King Dark. The Weapon of Terror Aims at Three Riders!! Rider 2, V3 and X all split into their own ways looking for G.O.D.'s main base, but neither Rider 2 nor V3 found it on time, leaving the final battle to X by himself. Farewell, X-Rider
Some time after Destron's destruction, Shiro Kazami ended up meeting another evil, this time while visiting Egypt, it was Marshal Machine, a demon cyborg from an organization called Delza Army. After some encounters in Egypt, Marshall Machine disappeared, infiltrating a ship from Alexandria that went to Japan, and V3 followed him. They faced each other again in Japan, but V3, while able to easily overpower him was yet again unable to stop him. He soon joined the new Rider, Stronger in his battle against the Delza Army, whose main forces were moving to Japan. The Man Who Returned! The Name is V3!!
Riderman, who had been fighting against Armored Knight in Greece and followed him to Japan comes into conflict with Stronger, believing that each other were helping Delza, but soon V3 appears and clears up the misunderstanding. V3 and Riderman leave and face the Delza Army troops who destroyed a dam, with Riderman facing Armored Knight and V3 taking on Commander Jishaku. However, Riderman is easily defeated and V3 is caught into a trap and is swallowed by a fissure. Riders Captured! Long Live Delza!!
Amazon and X rescue V3 and Riderman, and they soon meet Stronger again, who had been joined by Rider 1 and Rider 2 in their absence. The seven riders, which would be known as the Seven Legendary Riders, marched against the Delza Army, who had captured Tobei Tachibana. V3 takes on Armored Knight and Shark Kikkaijin. Finally, Stronger finishes off Marshal Machine. They meet Tachibana, but soon a familiar voice welcomes then, Destron's Great Leader's.
The Great Leader reveals that he had been behind the Delza Army, Destron and other previous evil organizations opposed by the Riders. He takes on the form of a rock giant, impervious to the attacks of the Riders. However, they combine their powers and go into his body. There, they find a giant alien brain who self destructs in an attempt to kill all seven Riders, however, they all escape successfully and leave, reminiscing everything they've gone through so far. Goodbye! The Glorious Seven Riders!
The evil organization Neo-Shocker moved ahead with its plans of global genocide. Shiro Kazami, Kamen Rider V3, alongside the other Seven Legendary Riders fought around the world against it, leaving Japan's protection to the new Kamen Rider, Hiroshi Tsukuba, Skyrider.
When V3 learned about Neo-Shocker's XY operation - where they'd distract Skyrider with operation X while they executing their real human bombs plan leaving Japan in chaos with operation Y. He warned Mr. Itou, one of Skyrider's allies about the plan and went on to face Bader, one of the Musasabader Brothers by himself to stop the operation. Kazami fought the brothers but was unable to destroy them until Skyrider arrived, and together, they defeated the Neo-Shocker agents. Monster Flying Squirrel Brothers and Two Riders
Neo-Shocker gathered an army of Second Generation Cyborgs in Japan, led by Gurand Bazarmy, known as the Strongest Cyborg on Earth, and also planned to launch a direct offensive with an experimental tank, the Varithium Cannon, led by Hirubiran. To save Japan, the seven Riders returned and, alongside Skyrider, destroyed the experimental Varithium Cannon. However, they were soon challenged by Gurand Bazarmy and his troops. Tank and Kaijin the Second Generation Corps, Full Force of Eight Riders
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