Marina Tsumura

is the childhood friend of Shotaro Hidari and the girlfriend of Yousuke Togawa. She transforms into the .
==History==
Marina Tsumura is a childhood friend of Shotaro Hidari. In 1999 as children, they were both in the audience during a performance by opera singer Melissa, before being evacuated by the police as Sokichi fights with the Spider Dopant.
As an adult she began working as a clothing designer for Windscale, where she met her boyfriend Yousuke Togawa.
Marina's career came to an abrupt end when her boss stole credit for her work and fired her along with Yousuke. Soon after, the two purchased Gaia Memories in order to exact their revenge on the company. However, their psyche was quickly warped by the Memories, with Yousuke going on a rampage soon after. Under the guise of concern for her missing boyfriend, Marina hired Shotaro (now a private detective) to track Yousuke down. After Yousuke was located and his memory destroyed by Double, Marina assumed her Dopant form to abduct and murder Yousuke, presumably to cover her tracks.
After Shotaro learned the truth, Marina tried to kill him as she assumed the T-Rex Dopant form. After a brief fight, T-Rex Dopant then transformed into the Big T-Rex and led Double on a chase around the city. As Double, Shotaro destroyed the T-Rex Memory with HeatMetal's Metal Branding Maximum Drive and handed Marina over to the authorities.
==Other Appearances==
===OOO, Den-O, All Riders: Let's Go Kamen Riders===
In an alternate 2011 in which Shocker ruled the world with all the other evil organizations and monster races, the T-Rex Dopant, user unknown, was part of a band of Dopants that were fought by Kamen Rider Double when the Kamen Riders returned to fight Shocker. 
===Kamen Rider Wizard===
The T-Rex Dopant was one of the monster souls, presumably the essence of the T-Rex Memory, which surfaced in the world within the Magic Stone. Appearing as Big T-Rex, it was part of an army of Amadum's strongest monsters which fought the 14 Heisei Riders, it was destroyed by the combined efforts of Double and several other Riders. 
===Kamen Rider: Climax Heroes W===
T-Rex Dopant is one of several villainous characters which appear in the Climax Mode game mode of Kamen Rider: Climax Heroes W as NPC characters the player must fight. They can later be unlocked for player use. However, they do not have Rider Finales, though they still have a Special Moves and it are stronger than any of the Riders' Special Moves.
===KAMEN RIDER: memory of heroez===
T-Rex Dopant, in its Big T-Rex form, serves as a boss in the game, fought by Kamen Rider Accel.
==T-Rex Dopant==
==Equipment==
===Devices===
*Gaia Memories - Transformation trinket
==Behind the Scenes==
===Portrayal===
Marina Tsumura is portrayed by , who previously portrayed in , as a child is portrayed by .
T-Rex Dopant is voiced by .
===Concept Art===
The T-Rex Dopant was designed by .
T-Rex Dopant concept art.jpg|T-Rex Dopant concept art
Big T-Rex concept art.jpg|Big T-Rex concept art
==Appearances==
* Kamen Rider W
**Episode 1: The W Search/Two Detectives in One
**Episode 2: Futo Tantei
* Kamen Rider × Kamen Rider OOO & W Featuring Skull: Movie War Core
**Kamen Rider Skull: Message for W
== External links ==
*Kamen Rider Zukan page on Marina Tsumura.
*Kamen Rider Zukan page on T-Rex Dopant.
==Navigation==
Category:W Characters
Category:Dopant users
Category:Kamen Rider W
Category:Dinosaur Monsters
Category:Tyrannosaurus Monsters
Category:Female Monsters
Category:Giant Monsters