is a Japanese tokusatsu series that serves as the 19th installment in the Kamen Rider franchise and the 10th entry in the Heisei era. These characters exist amongst various iterations of reality within the series referred to as an A.R. World (Another Rider's/Alternate Reality World).
Main characters Hikari Studio The is the photography studio that the Hikari family owns and where Tsukasa Kadoya develops his photographs. The various backdrops located in the studio allow it to transport its occupants to a multitude of parallel worlds. Its interior and exterior automatically transform to blend into the surroundings when moving across dimensions.Kamen Rider Decade episode "Rider War"
Tsukasa Kadoya is a hypocritical and self-righteous man whose had no memory of his past, having a strong desire to "catch the world" using his photos. But the fact that Tsukasa's photo never develop well hint him to be from another world while unaware of the effect as prelude of a convergence of the alternate dimensions known as A.R. Worlds that threaten the main universe. Approached by Wateru Kurenai while acquiring the DecaDriver, Tsukasa begins a journey to other Kamen Riders' worlds to save the prime universe as Kamen Rider Decade. But as Decade, besides exhibiting in-depth knowledge of a world he is in, Tsukasa faces both threats that endanger the worlds and the interference of Narutaki who spreads rumors of him as a . But Tsukasa soon understands what Narutaki meant upon learning that he was originally the Great Leader of the Dai-Shocker organization which sought to take all dimensions and that his true mission is to destroy the other A.R. World Riders and their worlds. Tsukasa undertakes the role, sealing the A.R. World Riders in cards before being fatally wounded by Natsumi when she becomes Kamen Rider Kiva-la. His death being the catalyst for the restoration of all the A.R. Worlds and those who died during the Rider War, Tsukasa is revealed by his friends' memories as he, the revived Kamen Riders, and Kamen Rider W defeat newly formed Super Shocker and the revived Neo Organism. Afterwards, Tsukasa and his friends return to the Hikari Studio to continue their journey across the A.R. Worlds.
Tsukasa utilizes the belt and to transform into Kamen Rider Decade. While transformed, he wields the , which can switch between , , and . He can also use the to assume the form of a past Kamen Rider and the , , and/or to access their arsenal as well as the to transform another Kamen Rider into a new form for a combo attack. His personal vehicle is the motorcycle, which similar to Decade himself can assume the form of a past Kamen Rider's motorcycle via the Attack Ride Cards.
While in the World of Negatives, Tsukasa acquires the cellphone that attaches onto the DecaDriver, replacing the card slot which is moved to his right hip, to enable him to assume where he gains the ability to manipulate the power of his nine Heisei Kamen Rider predecessors' final forms, whom he can summon through the K-Touch, for powerful combo attacks. A stronger variation of the form is , which has the Kamen Ride Cards of his predecessors' final forms on his armor.
During the events of the crossover film Kamen Rider × Kamen Rider W & Decade: Movie War 2010, Tsukasa assumes the destructive embodiment of his Rider form known as , which allows him to use any Attack Ride Card without having to transform into the associated Rider, until he is defeated by Natsumi as Kamen Rider Kiva-la.
During the events of the crossover film Kamen Rider × Super Sentai: Super Hero Taisen, Narutaki restores Dai-Shocker and enters an alliance with the Super Sentai villains that formed the Dai-Zangyack. Tsukasa, feigning to resume his role as Dai-Shocker's leader, declares war on the Super Sentai and battled Captain Marvelous of the Gokaigers to an epic standstill before faking their deaths to catch the villains off guard once they reveal their actual plan to take over the world. Tsukasa also appears in the Kamen Rider Wizard finale when summoned by the sorcerer Amadum to attack Haruto Soma, only to aid his successor in defeating the villain before departing for points unknown.
Tsukasa later returns in Kamen Rider Zi-O to help change Sougo Tokiwa's destiny and ensure he becomes a hero instead of a tyrant, using an upgraded version of the DecaDriver called the to access the forms and powers of his successors up to Kamen Rider Zi-O. During the events of the special episode Rider Time: Kamen Rider Zi-O vs. Decade: Seven Zi-O!, he acquires an upgraded version of the K-Touch called the that allows him to assume an evolution of Complete Form called , which grants access to the powers of his successors' final forms up to Kamen Rider Zero-Two.
Tsukasa Kadoya is portrayed by . As a child, Tsukasa is portrayed by .
Natsumi Hikari , referred to as by Tsukasa, is a young woman who works at the photo studio under her grandfather, having lived with him since her childhood. Prior to the series, Natsumi was a member of the , or for short, a group of dropouts who got bored with school and wanted to find out their own answers. But they never carry out their intent and return to school, promising to meet again years later.Kamen Rider Decade episode "The Nega-the World's Dark Riders" At the start, Natsumi begins to have nightmares of Decade prior to finding Decade's belt and giving it to Tsukasa. Fully aware of world's endangerment, Natsumi decides to accompany Tsukasa on his journey to prevent her dream from coming true.
She occasionally keeps Tsukasa in line with the but she had also used the technique on other people such as Yusuke and her grandfather.Kamen Rider Decade episode "Here Comes Super Momotaros!" She also appears to have feelings for Tsukasa, or at least cares for his well-being, which is hinted during her conversation with Yusuke Onodera.Kamen Rider Decade episode "Transcendence" Despite Narutaki's offer to save her, she refuses and chooses to see Decade's journey to the end.Kamen Rider Decade episode "Super Trick of the Real Criminal"
However she starts worrying during the time in the World of Hibiki after hearing from Narutaki that Decade's action is actually destroying the world.Kamen Rider Decade episode "Journey's End" While in the World of Shinkenger, Natsumi assures Tsukasa that the Photo Studio is his home before her near-death experience by Apollo Geist in the World of RX, learning that Tsukasa used some of his life to save her later. It is only after their adventures in the World of Amazon that Natsumi ponders if there's a point behind their journey.
In Kamen Rider Decade: The Last Story, Natsumi becomes with the use of Kiva-la, but unlike Kiva the belt does not materialize first and it does not require Kiva-la's bite. Instead, it is a kiss to the user's forehead, which then creates a heart-shaped emblem and she becomes the after transformation. Also different is that Kiva-la does not perch on her belt during the transformation. As Kamen Rider Kiva-la, Natsumi wields the , with which she can use the butt to perform a variation of her trademark "Laughing Pressure Point". Natsumi transforms into Kamen Rider Kiva-la to stop Decade Violent Emotion's rampage, being described as the only one able to do so. She later transforms to help Decade, Kuuga, and Diend defeat the rest of Super Shocker, as well as rescue her grandfather from the Super Crisis Fortress. Like Kiva, Kamen Rider Kiva-la's motif is that of a bat.Figure Oh No. 141, November 2009
Natsumi Hikari is portrayed by .
Eijiro Hikari is the owner of the Hikari Studio and Natsumi's grandfather. When he discovers that his photo studio is the means of accessing the A.R. Worlds by accident, he is not surprised but amused at the fact and is glad to assist Tsukasa in his mission. Whenever they arrive to a different world, he cooks a different meal each time. Eijiro is also the most easygoing of the group and gets along well with Kiva-la.Kamen Rider Decade episode "Battle Trial: Ryuki the World"
In the World of Decade, Eijiro is revealed to be a guise assumed by Shocker's , an executive member of Dai-Shocker from Switzerland. Doctor Death has the ability to assume the form of the squid-like cyborg , which he claims is his greatest creation. Though seemingly killed in the final battle by Decade, Diend, and Momotaros using several other Riders as weapons, Doctor Death resumes his Eijiro guise, who seemingly forgets ever being Doctor Death to begin with.Kamen Rider Decade The Movie: All Riders vs. Dai-Shocker
In Kamen Rider × Kamen Rider W & Decade: Movie War 2010, the black ShinigamiHakase Memory, given to him by his longtime friend, Ryubee Sonozaki, transforms him into , though his official name is the , the leader of Super Shocker against his will due to the influence of the Gaia Memory. That is also the explanation for Eijiro becoming Doctor Death in the previous movie.In the commentary track of the Director's Cut DVD of Movie War 2010, Director Ryuta Tasaki said that Movie Wars 2010 settled the mystery of how Eijiro became Doctor Death in the previous movie. He revives the Neonoid to defeat Kamen Rider Decade once and for all. However, Super Doctor Death reverts to Eijiro as the Memory ejects out of him caused by Kamen Rider W Heat Metal's HardMammother Maximum Drive and he is saved by Natsumi in her Kamen Rider Kiva-la form. Afterwards he returns to the studio with the others once Ultimate D is destroyed by Decade and W.
Eijiro Hikari and Doctor Death are portrayed by while Ikadevil is voiced by .
Yusuke Onodera is a young man with a friendly but immature personality who has the power to become . Although originally from the World of Kuuga, he eventually joins up with the Hikari Studio group having rid his home world of the Gurongi.Kamen Rider Decade episode "the World of Kuuga"
Unlike his original counterpart, Yusuke is not shown to have access to the Rising versions of his four main forms. However, during the events of the film Kamen Rider Decade: All Riders vs. Dai-Shocker, he is forcefully transformed into Kamen Rider Kuuga when High Priestess Bishium uses the Earth Stone on him. Yusuke initially lacks control of himself in this form, which is signified by having the black-colored , but once he breaks free of Bishium's control the eyes change to red.
While in the World of Agito, Yusuke briefly wears the suit. In the World of Den-O, he is possessed by Momotaros, who uses his body to become .
Yusuke Onodera is portrayed by .
Kiva-la is a white-colored female Kivat originally from the World of Kiva, where she is Kivat-bat the 3rd's younger sister. She is extremely tiny, small enough to be hidden in an adult's closed fist. She learns of Decade from Narutaki, and uses her power to bring Yusuke into her world, and then sends Tsukasa into another to do battle with Kaixa.Kamen Rider Decade episode "Second Movement ♬ Prince Kiva"Kamen Rider Decade episode "The Biting King's Qualifications" She later ends up traveling with the Hikari Studio, though remaining in contact with Narutaki with only Natsumi aware of it. She seems to like Yusuke the most out of the traveling group as she is delighted when he returns to travel with them after they leave the World of Agito.Kamen Rider Decade episode "Awakening: Tornado of Souls" In the World of Hibiki, she assists Ouja in summoning a Bakegani to be used on Decade as Gyuki was not getting the job done, placing her overall goals further into question.
In Kamen Rider × Kamen Rider W & Decade: Movie War 2010, Kiva-la is revealed to be the means for Natsumi to assume her Kamen Rider form: Kamen Rider Kiva-la.
Kiva-la is voiced by .
Daiki Kaito