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The Dopants are the antagonists in the Kamen Rider spinoff series Kamen Rider Double. Dopants are actually normal humans who use Gaia Memories. The Gaia Memories are aspects of the true Gaia Memory, the knowledge of everything on the Earth. These were originally accessed due to Philip's link to the Gaia Memory by means of the Gaia Library. But after he was taken from them, the Sonozaki Family uses a strange temple underneath their mansion to access the Gaia Memory. They then sell these to the highest bidder or to common criminals, both types used as guinea pigs to study the Gaia Memories as part of the Gaia Impact project. The name comes from the English words "dopant" and "doping".
Dopant Gaia Memories
A Gaia Memory is a mysterious device resembling a USB flash drive that contains all of the Earth's knowledge of what it represents. This enables its user to become a Dopant, or in some special cases, a Kamen Rider. Every Gaia Memory is adorned with the first letter of its name, stylized to reflect the powers it imbues on its user. For example, the Injury Memory (acquired by Shotaro and Philip before the series begins) resembles a broken bone in the shape of the letter I. Each Memory also features a button which when clicked causes the Memory to loudly declare its name; while this is traditionally done immediately before inserting the Memory by Riders and Dopants alike, it is unclear if it is actually mandatory to activate the Memory's powers. In order to transform into a Dopant, the Gaia Memory is first inserted into a device called the L.C.O.G (the acronym for "Living Connector Setting Operation Gun", though normally called called a Connect Shooter, which then produces a USB port-like tattoo on the user's skin called a Living Connector. Whenever the Gaia Memory is pressed onto the Living Connector, it enters the user's body and transforms the user into a Dopant. Use of a Gaia Memory without a Living Connector is possible, but the side effects of doing so are nearly fatal.
This direct insertion will eventually drive its user insane from its addictive influence, which is why special belts called Memory Drivers have been developed for use by high ranking members of the Museum to filter out these and other side effects. This has the side affect of visibly weakening the Dopant's powers. Due to this, Museum members use some of the strongest Gaia Memories ever created to more than compensate the loss of power.
To defeat a Dopant, a Kamen Rider has to use one of his Maximum Drive finishing attacks to eject and destroy the Gaia Memory, resulting in what is called a Memory Break'. Evolved Gaia Memories, however, require a direct strike on its location within the Dopant's body to execute the Memory Break without the risk of killing the user. If the Dopant does not have a Living Connector, a Memory Break will not occur, however the Gaia Memory will still be ejected from the user's body. In order to defeat a Dopant that uses a Memory Driver, the belt must be broken in order to defeat the Dopant and cause the Memory Break.
In the movie Double Forever, the Dopants use T2 Gaia Memories, 26 special Gaia Memories developed by Foundation X based on Fumine Sonozaki's findings. Though originally in the possession of Jun Kazu before giving it to another member of the Foundation to take to their headquarters, the T2 Gaia Memories end up in the possession of mysterious terrorist group NEVER. Unlike the original Gaia Memories, these memories appear to have some sentience, injecting themselves into people who are compatible with them (Watcherman and Santa-chan) or causing a Living Connector to appear on someone's skin (Queen). Other than their leader, each member of NEVER uses a T2 Gaia Memory based on one of Kamen Rider Double's Gaia Memories.
Other Gaia Memories seen, yet not used in the series include Finger, Lightning, Key, Umbrella, Gravitation, Apple, Star, Dog, Injury', Crab', Orange', Time, Zero, Jazz', Ear', Music', Hell, You, Pyramid, and Ocean'.
In the real world, special edition Kamen Rider Gaia Memory Toys feature not only Gaia Memories used in the series but also Gaia Memories that features Kamen Riders, the Imagin Momotaros, and limited edition Gaia Memories like the Ganbaride Gaia Memory and the CycloneJoker Televikun Gaia Memory.
Though they weren't part of Dai-Shocker initally (as Kamen Rider W is a post-Decade show), at least one Dopant, the Weather Dopant, was part of the revived Dai-Shocker assembled by Decade to wipe out the Super Sentai, ensuring the survival of the Kamen Riders. After Dai-Shocker's alliance with Dai-Zangyack was revealed, both organizations were wiped out by a gathering of Kamen Riders and Super Sentai.
Several Dopants, along with Yummies, Zodiarts, and Phantom, were part of the Monster Army, a hoard of kaijin who were revived by the Akumaizer to conquer humanity. They were defeated by a group of eight Kamen Riders consisting of Kamen Rider Wizard, Fourze, Meteor, Nadeshiko, Double, Accel, OOO, and Birth.
- Main article: Sonozaki Family
- Main article: Shinkuro Isaka
- Main article: Masquerade Dopants
- Main article: Foundation X
- Main article: Jun Kazu
- Main article: EXE
- Yousuke Togawa/Magma Dopant
- Marina Tsumura/T-Rex Dopant
- Taizo Kaga/Money Dopant
- Genzo Takamura/Anomalocaris Dopant
- Ikari/Cockroach Dopant
- Yukiko Sasaki/Sweets Dopant
- Sachi Yamamura/Virus Dopant
- Tsuyoshi Ageo/Violence Dopant
- Kenji Kurata/Arms Dopant
- Bird Dopant
- Kiyoshi Katahira/Ice Age Dopant
- Aya Kujo/Triceratops Dopant
- Sachio Sawada/Liar Dopant
- Keio Horinouchi/Puppeteer Dopant
- Lily Shirogane/Invisible Dopant
- Hajime Fukushima/Nightmare Dopant
- Maruo Arima/Beast Dopant
- Suzuko Arima/Zone Dopant
- Yukie Sudo/Yesterday Dopant
- Nagi Shimamoto/Quetzalcoatlus Dopant
- Grasshopper Woman/Hopper Dopant
- Toru Kawai/Gene Dopant
- Makoto Uesugi/Jewel Dopant
- Takashi Soma/Old Dopant
- Energy/Energy Dopant
In Kamen Rider × Kamen Rider Double & Decade: Movie War 2010's Kamen Rider Double: Begins Night, Masquerade Dopants appear in the movie as well.
- Death Dopant
- Father Roberto Shijima/Dummy Dopant
- Super Dr. Shinigami
- Seiichiro Matsui/Spider Dopant
- Eren Komori/Bat Dopant
- Izo Aida/Oyakodon Dopant
- Bean Dopant
- Kabuki Dopant
- Yoga Dopant
- UFO Dopant
- Hiroshi Sagami/Commander Dopant
- Delza Army
- Dogma Kingdom
- Jin Dogma
- Crisis Empire
- Fog Mother
- Mirror Monsters
- Sonozaki Family
- Foundation X
- Monster Army