Kouji Segawa

Kamen Rider J (仮面ライダーJ) is the main protagonist in the Japanese tokusatsu movie Kamen Rider J.

Kouji Segawa
Kouji Segawa (瀬川 耕司) is an environmentalist reporter who was investigating the pollution by the lake. He was killed while attempting to protect his young friend, Kana and was thrown over the cliff by the Fog Mother's child Agito as Kana is taken by the insectoid Zu. However, Kouji was resurrected by the Earth Spirits as a J-Powered Warrior, Kamen Rider J, acting on their will to fight the Fog with their emissary Berry as his guide. With Fog Mother sensing Kouji's presence, Agito attempts to finish the job in his true form, only to be killed by J. Hurrying to Kana, Kouji enters their domain and faces Zu as she assumes her true form. Facing her, J manages to mortally wound Zu as she grabs him, taking to before they crash into the fortress which is Fog Mother.

After she dies, Kouji learns of Fog's intention of feeding humanity to Fog Mother's brood as Garai completes the ritual and sends Kana to the hatching chamber while manhandling Kouji. Berry intervenes to free Kana from Fog's spell before being struck down by Garai as Kana is sent down to her death while Fog Mother begins attacking a nearby city to prepare for her children's awakening. Assuming his Rider form, J fights Garai in his true form, Cobra Man, in a heated battle. After killing Garai, J is being digested by Fog Mother as he attempts to save Kana. However, absorbing the life energy around him, J kills off Fog's newly born spawn as he escapes the bowels of Fog Mother and assumes Jumbo Formation. After ripping Kana out of Fog Mother, J battles the monster before killing her as she attempted to take him down with her. Escaping Fog Mother's destruction, Kouji takes Kana to a serene environment with Berry watching from a distance.

Kamen Rider World
Later, J teamed up with Kamen Rider ZO. The two riders fought a gang of five revived monsters led by Shadow Moon: Sai Mutant, Cyborg Soldier Lv. 2, Agito, Garai, and Zu. Berry witnessed Shadow Moon's plot and is attacked by the mutants. Masato and his sister Ayumi stumble onto an injured Berry by chance and are chased by the revived mutant army as a result.

However, they are saved by the sudden arrival of Kamen Rider ZO on his ZO Bringer motorcycle, who thwarts off the monsters into a nearby abandoned warehouse. ZO is suddenly assisted by Kamen Rider J, who arrives into the warehouse on his J Crosser bike. The five mutants are defeated by the combined forces of the new Double Riders. The two are then challenged by Shadow Moon, who enlarges himself into giant proportions. J grows into giant size as well and fights off Shadow Moon by himself. Shadow Moon is defeated and peace returns to the day.

Decade: Final Chapter
He fought Tsukasa (Kamen Rider Decade Violent Emotion) in Jumbo form, but was defeated when Decade used The Side Basshar & G4's Gigant Kamen Ride Cards bombarding him with a barrage of missiles and sealed him in a Kamen Ride Card. J was depicted as slow moving in Jumbo Formation and unable to land a hit against the card wielding Kamen Rider.

Let's Go Kamen Riders
A mishap caused by the Greeed Ankh unintentionally altered the timeline which enabled Shocker to utilize the Core Medal to create the Shocker Greeed which defeated the Double Riders and seemingly erased the legacy of the Kamen Riders from history. In 2011, after Kamen Rider New Den-O's attempt to repair the damage, he along with Kamen Rider OOO and M-Ankh awaited execution. However, it was revealed the Double Riders had their brainwashing removed by a Shocker scientist.

The Double Riders joined with New Den-O and OOO to fight Shocker's forces, but were eventually defeated. When the order was given to kill everyone, V3 suddenly appeared, asserting that there were more than four riders. V3 was soon followed by all the other revived riders that came after him, including J, as even though Rider history was changed, the people's memories haven't changed.

After the riders were united, they faced off against Shocker's Great Leader. Later, when joined by a force of extra riders, J and all the other riders got on their motorcycles and performed the "All Rider Break", ramming into the Rock Great Leader and defeating it once and for all.

Super Hero Taisen
J was among the Kamen Riders caught up in the 'Super Hero Taisen' incident. He was presumably sent to the dimensional rift, under the pretense of being defeated, by Captain Marvelous while he was apparently hunting the Riders. When his and Tsukasa's ruse was revealed, J and the other Riders appeared through the dimensional wall. J then fought alongside all the other Kamen Riders and Super Sentai against Dai-Shocker and Dai-Zangyack's Shocker-Zangyack Alliance.

Kamen Rider Taisen
J, in Jumbo Formation was seen fighting Fourze in Rocket States as he manage to defeat him. After Fourze is defeated, Gaim in Suika Arms would later fight J. However, he got himself defeated as a result, turning him into a Lockseed.

J-Spirit


The J-Spirit (Jスピリット) is Kamen Rider J's transformation belt.

J-Crosser


The J-Crosser is a Suzuki off-road bike that Kamen Rider J rides on. It has the ability to reach a speeds up to 1300 km/h (807 mph). Kamen Rider J also can use the J-Crosser to execute the J Striker attack.

Kamen Ride Cards
Kamen Ride J (カメンライドJ) is the Kamen Ride Card which contains the power of Kamen Rider J. Used by Diend to summon Kamen Rider J in Jumbo Formation. Used in the World of Decade to fight King Dark.

In All Riders vs. Dai-Shocker, Decade Complete Form Jumbo Formation performed the Final Dimension Kick, a variation of the Dimension Kick, transforming the Shōwa Riders, including J, and Heisei Riders into Kamen Ride cards for Decade to travel through as opposed to Final Attack Ride cards before hitting the target.

In Kamen Rider × Kamen Rider W & Decade: Movie War 2010, Decade acquires Kamen Ride Cards for all of the Kamen Riders he defeats, including J, Skyrider, and Super-1.

Lockseed

 * Kamen Rider J Lockseed (仮面ライダーJロックシード): A Lockseed bearing the likeness of Kamen Rider J, created when J was defeated in the battle between the Showa Riders and Heisei Riders. When inserted into a Sengoku Driver or when channeled through the Showa Rider Lockseed, it would allow an Armored Rider to assume J Arms (Jアームズ). It is styled for Gaim and Kurokage-styled in the toyline.
 * Transformation: J Arms! Shingeki Jumbo Formation!
 * Squash: TBA
 * Au Lait: TBA
 * Sparking: TBA

Other Appearances
Although Yūta Mochizuki has never returned to portray the character Kouji Segawa, the "Kamen Rider J" character has appeared in later Kamen Rider/Super Sentai live action productions.

Kakuranger Stage Show at Super Hero Korakuen Yuenchi
In a stage show where the Kakurangers are seen fighting their usual foes, the Bandora gang, the Gorma tribe, and Fog show up and end up defeating them. Kamen Rider J, RyuuRanger, HououRanger, TyrannoRanger, & DragonRanger arrive to assist the Kakurangers.

Video Games

 * Kamen Rider J is a playable character in the 2011 Nintendo DS video game All Kamen Rider: Rider Generation and Rider Generation 2 for the Nintendo DS and Sony PSP.

Kamen Rider Battle: Ganbaride
"To be added"

Portrayal
Kouji Segawa was portrayed by Yūta Mochizuki (望月 祐多). As Kamen Rider J, his suit actor was Jiro Okamoto (岡元 次郎).
 * In Kamen Rider Decade: All Riders vs. Dai-Shocker, he was voiced by Kouta Nemoto (根本 幸多) and portrayed by suit actor Jiro Okamoto (岡元 次郎).
 * In Kamen Rider Decade: The Last Story, he was voiced again by Kouta Nemoto (根本 幸多) and portrayed by an unidentified suit actor.
 * In Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai, Kamen Rider J is voiced by Tetsu Inada (稲田 徹)

Also see

 * Dex Stewart, his counterpart in Saban's Masked Rider.