Koji Segawa

is the main protagonist of the movie Kamen Rider J. He is granted the J Power by the Earth Spirits and transforms into to fight against the Fog.
==History==
===Kamen Rider J===
Koji Segawa is a rising nature photographer. (2013). "Definitive Edition All Kamen Riders & All Monsters Super Encyclopedia <Showa Edition>”. p. 98. ISBN 978-4-06-304836-0. who mainly deals with wildlife and natural scenery, interested in environmental issues like the pollution of mountain lakes and forests in Japan. During the investigation, 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, Koji 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 Koji's presence, Agito attempts to finish the job in his true form, only to be killed by J. Hurrying to Kana, Koji 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, Koji 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 Koji. 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, Koji takes Kana to a serene environment with Berry watching from a distance.
===Later Appearances in Kamen Rider/Super Sentai live action productions===
===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. 
===All Riders vs. Dai-Shocker===
Using his Kamen Ride Card, J was summoned by Diend in Jumbo Formation at the end of the battle between the Kamen Riders and Dai-Shocker to fight Kingdark. J was referred to Diend as "a treasure he'd been saving". Quickly knocked back, Diend used the Final FormRide: Decade card to turn Decade into a giant Decadriver that attached onto J, turning him into a giant Decade Complete Form. The battle ended using the Final KamenAttackFormRide card, kicking through giant cards of all the primary Riders and performing the Final Dimension Kick, defeating Kingdark. 
===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 a Cell 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 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 against Dai-Shocker and Shocker-Zangyack Alliance. 
===Kamen Rider Taisen===
thumb|J vs Gaim Suika Arms
J, in Jumbo Formation was seen fighting Fourze in Rocketstates after he defeated Skyrider, and defeats the space Rider with a Jumbo Rider Punch when the latter tried to hit him with a Rider Double Rocket Drill Kick. After Fourze is defeated, he would later engage Gaim in Orange Arms, who then assumed Suika Arms Gyro Mode as he jumped off his shoulder after running up the enlarged Rider to properly fight J, with the smaller Rider proved to be more than a perfect counter to J. J was then defeated by Yoroi Mode skewering his Suika Sojinto hard into his chest, turning him into a Lockseed. 
===Super Hero Taisen GP: Kamen Rider 3===
Due to the timeline alteration caused by Shocker, J became one of the brainwashed Riders in that timeline, donning the name of Shocker Rider J. In Jumbo Formation, J menaced the rebel Kamen Riders, Shinnosuke Tomari, Go Shijima and Kyoichiro Kuroi as they made camp overnight. As Shinnosuke made his stand, J faced down the Tridoron Type Wild only to lose his prey as Yuto Sakurai's ZeroLiner intercepted and spirited Tridoron away.
Later on, he aided the other Riders to combat Shocker after he, and the other Riders, were released from being brainwashed by the revived Double Riders. J appears in Jumbo Formation to fight the Rider Robo, but then, he is erased from history by the Robo's in-built History Modifying Machine. He is restored along with all the other Riders when the Rider Robo is destroyed by Tridoron. 
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Though he was seemingly erased as a result of Asmodeus’ manipulations, he was restored back into existence once Touma Kamiyama had helped Shotaro regained his passion in drawing out the superheroes that he wants to draw out.
During the climatic final battle itself, he can be seen fighting alongside Kamen Rider 2, and .
==Appearances in other media==
Although Yuta Mochizuki has never returned to portray the character Koji 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 are seen fighting their usual foes, The , the , and Fog show up and they end up defeating them. Kamen Rider J, , , & then arrive to assist the Kakurangers.
==Video Game appearances==
===All Kamen Rider: Rider Generation/Rider Generation 2===
Kamen Rider J is a playable character in the 2011 Nintendo DS video game All Kamen Rider: Rider Generation and its sequel, Rider Generation 2 for the Nintendo DS and Sony PSP.
===All Kamen Rider: Rider Revolution===
He is also playable in All Kamen Rider: Rider Revolution, as is his Jumbo Formation form, which makes this the first console game to have his form be playable.
===Kamen Rider Battle: Ganbaride===
Kamen Rider J is a playable character in Ganbaride with other Riders.
===Kamen Rider Battle: Ganbarizing===
J is among the vast majority of Kamen Riders that are available in this arcade game.
===Kamen Rider SD===
Although J did not show up in any Kamen Rider SD media such as manga, OVA, or video games, his SD counterpart was released as a soft vinyl figure toy in one of the SD toy lines along with and .
==Personality==
to be added
==Forms==
==Equipment==
===Device===
*J-Spirit: Transformation belt
*Jumbo Decadriver: Transformation belt
===Weapons===
*Ride Booker - Decade Complete Form Jumbo's primary weapon
===Vehicle===
*J-Crosser: J's Rider Machine
==Legend Rider Devices==
==Relationships==
===Allies===
*Kana Kimura: to be added
*Berry: to be added
*Earth Spirits: to be added
===Enemies===
====Fog====
*Fog Mother: to be added
*Garai/Cobra Man: to be added
*Zu/Hachi Woman: to be added
*Agito/Tokage Man: to be added
==Behind the Scenes==
===Portrayal===
Koji Segawa was portrayed by , who previously played in the Super Sentai series, . As Kamen Rider J, his suit actor was .
*In Kamen Rider Decade: All Riders vs. Dai-Shocker, he was voiced by and portrayed by suit actor .
*In Kamen Rider Decade: The Last Story, he was voiced again by 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 
===Rider No.===
As the leading Rider protagonist of Kamen Rider J, Koji Segawa (Kamen Rider J) is labeled and . 
Before this definition in the Decade net movies, J was originally referred to as the in trailers for the film, as Kamen Rider Black RX was originally seen as a form change for Black rather than a separate Rider.
==Notes==
*Kamen Rider J closely resembles Kamen Rider ZO, the rider directly preceding him.
**This is because the producer of the two films wanted the two to be the new Double Riders.
** This was mentioned by Kamen Rider ZO himself in the 4th episode of the Lets Go Kamen Rider Net Movies, Listen Quietly! The Tragedy of the 20th Anniversary Rider!, where he complained that no one can tell him apart from J when they are in a scene together.
*Koji is alternatively referred to by the Earth Spirits and Berry in the film as the J Power Warrior.
*In the film, Koji had a habitual quirk of quickly doing a hand motion that makes the shape of a "J" with his fingers and thumb before executing a Rider Punch or Rider Kick finisher.
**Oddly enough, due to the finisher names that start with the "J" letter, Koji, while in his Rider form, only names his finishers with the start of the word "Rider" in from his film to future installments. The reason for this is unknown.
*J's Jumbo Formation is an uncommon example of a Kyodai Hero (giant hero) being constrained by the real world square-cube law; though J is considerably stronger in his larger size, he moves much slower, and the ground can be visibly seen cracking under the weight of his body when his Jumbo Formation first materializes.
*Shotaro Ishinomori, despite creating J, initially opposed the idea of J's superpower to grow to giant size, thus it did not make it to the final draft of the movie's script. The idea was pushed by Toei executives after the success of the where Kamen Rider 1 grew to Ultraman's size to help him, which proved to be a popular highlight of the special by fans. It wasn't until Ishinomori realized the film needed an exciting climax did he finally agree to put it back into the script under the condition that the ability had limited use and was "a miracle given to J by the power of the Earth".
*Kamen Rider J is considered by fans to be the last of the Showa Era Riders due to Shotaro Ishinomori's death in 1998, despite the official Showa Era ending in 1989 with the death of Emperor Hirohito. Toei eventually adopted this same classification in the 2014 film Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai in respect to the creator of the franchise as well as the fans. All future Riders would be classified as Heisei Riders due to them being created without Ishinomori's involvement.
*In the early promo shown during the Winter 1995 (January) Fox Kids affiliate meeting, J appeared in the title card instead of Kamen Rider Black RX in the airing
==Appearances==
==See also==
 (civilian counterpart)
===Footnotes===
==Navigation==
Category:J Characters
Category:Kamen Riders
Category:Movie Riders
Category:Heroes
Category:Showa Era Riders
Category:Revived Riders
Category:Cyborg Riders
Category:Decade Riders
Category:Primary Riders