Natsumi Hikari

is a young woman who works at the Hikari Photo Studio under her grandfather, Eijiro Hikari while traveling through the A.R. Worlds with Tsukasa. She transforms into in Kamen Rider × Kamen Rider W & Decade: Movie War 2010 to save Tsukasa from his Violent Emotion form. 
==History==
===Background===
Natsumi Hikari is the granddaughter of Eijiro Hikari and lived with him in his photo studio, Hikari Studio. In high school, Natsumi and her group of friends formed the Taigaku Club, or the "TG Club". The club was created for students who intended to drop out of high school to find their own answers in life. Eventually, they changed their minds and decided to finish high school, dissolving the TG Club and promising to meet each other again later on.
As a young adult, Natsumi came across the new employee of Hikari Studio, who went by Tsukasa Kadoya. She is often irritated by Tsukasa's antics towards the other customers due to the distorted images he takes and his negative attitude. She occasionally uses the Hikari family's "secret technique", the , to keep Tsukasa in line by striking a pressure point on the target's neck that causes them to laugh uncontrollably.
===The Destruction of Her World===
For a while, Natsumi has been receiving reccuring nightmares of a war involving Kamen Riders united against a single force known as "Decade". After leaving the studio to scold Tsukasa over his bad photos, the both of them are separated by an Aurora Curtain. While running away from being chased by monsters, she discovers the Decadriver and Rider Cards from a rubble. When she finally runs into Tsukasa again, she hands him the belt and cards right before being attacked by monsters. Natsumi was present when Tsukasa transformed into Kamen Rider Decade and watched him defeat the horde of Worm, Orphnoch, and Makamou. Confused by the ordeal, Natsumi and Tsukasa find her world besieged by monsters. With Tsukasa given the task to travel to nine worlds to prevent the destruction of this world, Natsumi decides to accompany him on his journey.
===Traveling Through The Nine Worlds===
Starting in the World of Kuuga, Natsumi continues to watch over Tsukasa and continues to worry that in the end, Decade will end up becoming a villain just like in her dreams. This all came ahead when Kamen Rider Kuuga, Yusuke Onodera, opposed Tsukasa which triggered another event in her dreams where Decade fought Kuuga, which worried Natsumi. Fortunately, Tsukasa and Yusuke ended up joining forces to defeat the Gurongi N·Gamio·Zeda from taking over the world. After the issue was solved, Natsumi would continue to follow Tsukasa in the World of Kiva where Yusuke would continue to accompany them.
After arriving in the World of Ryuki, she meets up with Reiko Momoi from Atashi Journal to question about the potential destruction of her world, only for Momoi to die under mysterious circumstances. Natsumi was later arrested and is judged during the Rider Trial where the Kamen Riders will fight each other in order to decide whether or not she is guilty, with Tsukasa as her lawyer. Fortunately, Decade and Ryuki managed to prevent Momoi's murder and also preventing Natsumi from being arrested. She would proceed on to the next world, heading towards the World of Blade.
Sometime after appearing in the World of Faiz, Natsumi along with Tsukasa and Yusuke would come across Daiki Kaito, who can transform into Kamen Rider Diend. Daiki is an inter-dimensional phantom thief travels through the A.R. Worlds in order to steal items he deems as treasures belonging to said worlds, while crossing paths with the Hikari Studio on many occasions.
After completing their mission in the World of Agito, Natsumi would arrive in the World of Den-O where she is present to see Tsukasa becoming Kamen Rider Den-O under the possession of an Momotaros, before forcing him into Yusuke's body. While trying to find Yusuke, Natsumi would end up being possessed by the other Taros and forced to fight Tsukasa as Den-O herself. Tsukasa and Natsumi would eventually be informed of the various time distortions of this world and would seemingly fix the problem. The Hikari Studio team later proceeded onto the World of Kabuto.
Landing in the last of the nine worlds, the World of Hibiki, Natsumi would be informed by Narutaki that she is the key to stopping Decade from destroying the worlds. Despite Narutaki's offer to save her, Natsumi chooses to stay with Tsukasa until the end of their journey, not believing him to be "the destroyer of worlds" that Narutaki makes him out to be. However, she starts to worry after hearing from Narutaki later on that Tsukasa's actions are actually destroying the worlds rather than saving them.
===Going For The New Worlds===
With the journey over, Tsukasa and the others of the Hikari Studio return to what appears to be Natsumi's world to find it back to normal as if it was not plagued by the monsters. While Natsumi reunited with her friends, she later comes across a doppelgänger of herself who reveals that this world is actually the World of Negatives and the Dark Riders have impersonated her friends. Natsumi would later give Tsukasa the treasure of this world, the K-Touch, allowing Decade to access his Complete Form to vanquish the Dark Riders. After saying goodbyes to her alternate self, Natsumi decides to continue travelling to the new worlds just as they arrived in Daiki Kaito's homeworld.
Arriving in the World of Diend, it appears to be a utopic society of happy and positive individuals, only to learn that this world is under the control of Fourteen and his Darkroachi. Natsumi is kidnapped by the Roaches to be conditioned into being a normal member of this world's society. After Fourteen's defeat, Natsumi is restored back to normal and would continue to travel to the next world.
In the World of Shinkenger, Natsumi is visibly worried for Tsukasa as he continues to explore a world without Kamen Riders. Natsumi would learn that even without Riders, this world is protected by the Samurai Sentai Shinkengers. After Tsukasa and Yusuke returned, she assures the former that the Hikari Studio will always be Tsukasa's home as where he came from, as it is the place that he "always returns to".
Entering the World of RX, she puts herself between Apollogeist and Tsukasa, deflecting Apollogeists's Perfecter, which was meant to drain the life energy from Tsukasa to prolong Apollogeist's life. Eventually she succumbs to the injury and dies in the hospital, as Daiki prevents Tsukasa from retrieving the Perfecter in time to save her life, but Tsukasa gives up part of his own life energy to revive her.
In the World of Amazon, she starts to truly wonder if there is a point in their journey, but continues in spite of that doubt. Just as the Hikari Studio crew begin to head towards the next world with Daiki accompanying them, Natsumi is shocked to learn that backdrop of the next and final world looks just like her dreams with the Kamen Riders charging after Decade.
===World of the Rider War===
Natsumi arrives into the final world, where all the Kamen Riders are supposed to be; "World of the Rider War". It is the same place that Natsumi saw when she had her dream about the war. Natsumi reveals to the others about her nightmares and desires to prevent it from happening. She is kidnapped by Apollogeist, who intends to make her his bride and feed off of her life force. She is saved by her comrades, but her nightmares become reality and the Rider War begins, despite their efforts to stop it. Natsumi is forced to witness the defeat of the Kamen Riders and Decade standing menacingly as she calls out his name.
===Decade's Final Chapter===
In Decade: Final Chapter, Natsumi and her grandfather live alone again, after Decade accepted his role as the Destroyer of Worlds. She tries to convince Tsukasa to stop what he's doing, but fails to make him see things her way after killing Yusuke. Instead, she becomes Kamen Rider Kiva-la, and fulfills her role as Decade's destroyer, as he allows her to kill him. Before dying, Tsukasa hands her the Rider Cards that the other Kamen Riders turned into after their defeat and asks her to remember them. The other Kamen Riders are revived, and Decade disappears.
After being told of Tsukasa's true role, she seeks out a way to revive him and succeeds by developing a half-exposed photo negative from inside Tsukasa's camera. Because it is a photo Natsumi took herself, it isn't warped, and she and the other A.R. Kamen Riders are able to fill in the blank areas of the photograph with their memories. Reunited with the rest of the group at last, Natsumi becomes Kamen Rider Kiva-la again to stop Super Shocker with Tsukasa, Daiki, and Yusuke and saves her grandfather after he reverts from Dr. Super Shinigami. She is last seen with her friends taking a picture after the conflict, after announcing their intent to continue traveling together.
==Later Appearances==
===Rider Time: Decade vs. Zi-O===
Natsumi as Kiva-la appears alongside Kuuga and Diend assisting Zi-O and Decade to defeat Ohma Zi-O but are unable to defeat him. 
==Video Game Appearances==
===Kamen Rider Buttobasoul===
Kamen Rider Kiva-la is a playable character in Kamen Rider Buttobasoul.
===Masked Rider Expansion===
Kamen Rider Kiva-La appears as a playable character in this trading card game with other Heisei era and Showa era riders.
===Kamen Rider Battle: Ganbarizing===
Ganbarizing Card Kiva-la.png
Ganbarizing Card Kiva-la, Marika & Poppy.png|With Marika & Poppy.
Kamen Rider Kiva-la in Ganbarizing.png
==Family==
Eijiro Hikari.png|Eijiro Hikari - Grandfather/Dr. Shinigami/Ika Devil
==Forms==
==Equipment==
===Devices===
*Den-O Belt - Transformation belt
*Rider Pass - Train pass used in transformation
*Kiva-la: Natsumi's Kivat partner
*Sengoku Driver - Transformation device
*Lockseeds - Gives access to Gaim's Arms changes, depending on which lock is used
===Weapons===
*DenGasher - a four-piece standard issue assemble side-arm that reconfigures to form various weapons.
*Kiva-la Saber: Personal weapon
*Musou Saber Holster - Carrier strap for Gaim's Musou Saber
==Imagin Possessions==
U-Natsumi.png|U-Natsumi
K-Natsumi.png|K-Natsumi
R-Natsumi.png|R-Natsumi
==Rider Card==
: A Rider Card containing the power of Kamen Rider Kiva-la.
==Behind the scenes==
===Portrayal===
Natsumi Hikari was portrayed by .
As Kamen Rider Kiva-la, her suit actor was .
===Meme===
A recurring running gag in the series when Natsumi heard something is not really right or getting into some troublesome actions by someone else will cause Natsumi fustrated and performing the Laughter Point into the side of their necks with a thumb. This meme is also appeared in Kamen Rider Decade: Final Chapter, where she used the technique at the Shocker combatant.
==Notes==
*It is unknown how Natsumi can transform into Kamen Rider Kiva-la since she isn't a Fangire herself and it is fatal for humans to even transform into Kiva, dying from use afterward.
**However, since Kiva-la comes from an alternate world that has differences from the original series, she most likely doesn't have this restriction, meaning humans can transform with her.
*Her version of Kamen Rider Gaim as seen in the S.I.C. Hero Saga can be considered to be the A.R. World counterpart of the original Gaim.
**Her version of Gaim also takes inspiration from Kiva-la's design, with a bat-shaped crest along with armor pieces resembling those of Kiva-la's.
==Appearances==
==References==
Category:Decade Characters
Category:Heroines
Category:Female Riders
Category:Decade Riders
Category:Movie Riders
Category:Heisei Era Riders
Category:S.I.C. Hero Saga Riders
Category:Supporting Riders
Category:Quaternary Riders