Gaia Memories

A Gaia Memory (ガイアメモリ) 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. In order to transform into a Dopant, the Gaia Memory is first inserted into a device called the L.C.O.G (Living Connector Setting Operation Gun), also called a Connect Shooter (コネクトシューター), which then produces a USB port-like tattoo on the user's skin called a Living Connector (生体コネクタ). Whenever the Gaia Memory is pressed onto the Living Connector, it enters the user's body and transforms the user into a Dopant. It is possible to use a Gaia Memory without a Living Connector however a side effect is that the user would later suffer intense physical pain after several uses.

This direct insertion will eventually drive its user insane from its addictive influence, which is why special belts called Memory Drivers (メモリドライバー) have been developed for use by high ranking members of the Museum to filter out these and other side effects. This weakens the Dopant visibly, as such high-ranking Museum members use some of the strongest Gaia Memories, identified by their golden colors, to more than compensate for this weakening. These Gaia Memories seem to be even more dangerous than regular Gaia Memories as hinted in the series. Despite the benefits, there are those who dislike the use of Drivers and would very much prefer the poisoning than being weakened, like Doctor Isaka. It also seems that when used excessively, the user will slightly gain the Gaia Memory`s powers as hinted when Ryubee who held the Terror Memory for at least ten years seemed to be able to intimidate others as well as flashed purple eyes when doing so.

Kamen Riders utilize Gaia Memories that have been refined such that they can only be used in specialized Memory Driver belts, and the Gaia Memories used do not enter the body and channels power through the Driver. These kinds of Gaia Memories were created by Shroud during her time as Fumine Sonozaki. This refinement makes them resemble USB drives, rather than the ribcage design on Dopant Gaia Memories, but further weakens the power of the Memories, only allowing access to the Memory's full power during a Maximum Drive.

To defeat a Dopant, a Kamen Rider has to use one of its Maximum Drive finishing attacks to eject and destroy the Gaia Memory, resulting in what is called a Memory Break (メモリブレイク). Evolved Gaia Memories require a direct strike on its location within the Dopant's body to execute the Memory Break. 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. Dopants who use Memory Drivers are not susceptible to Memory Breaks.

List of Gaia Memories
{{#tag:tabber| Kamen Rider= {{#tag:tabber| Double=
 * Shotaro Hidari (left half side)
 * {{nihongo|{{w|Joker (playing card)|Joker}} Memory|ジョーカーメモリ|Jōkā Memori}}: The Joker Memory, also known as the {{nihongo|Ace Memory|切り札の記憶|Kirifuda no Kioku}}, allows the user to increase fighting potential and enhances the users reflexes significantly, becoming the {{nihongo|Skill Warrior|技戦士|Waza Senshi}}. When used, half of Kamen Rider Double becomes the black {{nihongo|Ace Left Half|切り札の左半身|Kirifuda no Hidari Hanshin}}. When the Joker Memory is placed in the Maximum Slot on the Double Driver, it allows Kamen Rider Double to split into two halves to deliver an elemental-powered Maximum Drive attack. The Joker Memory can also be used with the Lost Driver to allow Shotaro to individually transform into Kamen Rider Joker.
 * {{nihongo|{{w|Metal}} Memory|メタルメモリ|Metaru Memori}}: The Metal Memory, also known as the {{nihongo|Steel Memory|鋼鉄の記憶|Kōtetsu no Kioku}} or the {{nihongo|Fighter Memory|闘士の記憶|Tōshi no Kioku}}, empowers the user with great strength and magnified resistance to physical harm, becoming the {{nihongo|Superpowered Warrior|怪力戦士|Kairiki Senshi}}. When used, half of Kamen Rider Double becomes the silver {{nihongo|Fighting Left Half|闘士の左半身|Tōshi no Hidari Hanshin}}. When the Metal Memory is placed in the Maximum Slot on the Metal Shaft, it allows Kamen Rider Double to infuse the tips of the Metal Shaft with an elemental-powered Maximum Drive attack. First used in All Riders vs. Dai-Shocker.
 * {{nihongo|{{w|Trigger}} Memory|トリガーメモリ|Torigā Memori}}: The Trigger Memory, also known as the {{nihongo|Sniper Memory|銃撃手の記憶|Jūgekishu no Kioku}}, turns the user into an expert marksman, becoming the {{nihongo|Gun Warrior|銃戦士|Jū Senshi}}. When used, half of Kamen Rider Double becomes the blue {{nihongo|Sniping Left Half|狙撃手の左半身|Sogekishu no Hidari Hanshin}}. When the Trigger Memory is placed in the Maximum Slot on the Trigger Magnum, it allows Kamen Rider Double to fire an elemental-powered Maximum Drive attack.

{{-}} }}

T2 Gaia Memories
T2 Gaia Memories are next-generation Gaia Memories developed independently by Foundation X and were started by Shroud's research before she left the Museum. They are carried at all times by Jun Kazu. Sometime later they are found by the terrorist organization, NEVER. All of them are similar in appearance to the Gaia Memories used by Kamen Riders but can be used to transform into a Dopant by direct insertion, or with a Memory Driver to become Kamen Riders. While identical to Kamen Rider's Memories in design, they have blue plugs instead of silver ones. While they can be ejected by way of Maximum Drives, they are usually incapable of being broken by such methods, which serves as a sign that T2 Gaia Memories are more resilent than their predecessors. These memories can also seemingly use their powers with one another like W can as Daido had shown when he used all their Maximum Drives at once.

Nevertheless, they were all eventually destroyed when Kamen Rider Eternal, who used all 26 of them at once, was defeated by Kamen Rider Double CycloneJokerGoldXtreme's Golden Xtreme.

Unused Gaia Memories
Several times in the television series, a briefcase filled with various memories are shown, with a great many of them never being used.
 * Key
 * Dog
 * Time
 * Lightning
 * Umbrella
 * Apple
 * Zero
 * Bean

Toy-Exclusive Gaia Memories
Special Edition= In real life, there exist exclusive illustration or toy Gaia Memories that do not exist in the television series, usually released in Kamen Rider related media, such as Televi-kun and Ganbaride.

A new batch of special Gaia Memories was released in 2013, more or less two years since Bandai stopped releasing Gaia Memories in any form — DX Candy Toy, Gashapon. One reason is the advent of Kamen Rider OOO's O Medals. Instead of Kamen Rider faces, the new releases feature logos of the riders' main form and/or final forms. Not only that, the new batch will include a full set of Showa Kamen Rider Memories, and Heisei Kamen Riders' Final Form (minus Wizard and future Riders) Memories.

There was a Gaia Memory Complete Selection that had Gaia Memories that weren't used in TV Shows or some of the movies.

Legend Rider=
 * Kamen Rider 1 (2013)
 * Kamen Rider 2 (2013)
 * Kamen Rider V3 (2013)
 * Riderman (2013)
 * Kamen Rider X (2013)
 * Kamen Rider Amazon (2013)
 * Kamen Rider Stronger (2013)
 * Skyrider (2013)
 * Kamen Rider ZX (2013)
 * Kamen Rider Black (2013)
 * Kamen Rider Black RX (2013)
 * Kamen Rider Shin (2013)
 * Kamen Rider ZO (2013)
 * Kamen Rider J (2013)
 * Kamen Rider Kuuga
 * Kuuga Ultimate (2013)
 * Kamen Rider Agito
 * Agito Shining (2013)
 * Kamen Rider Ryuki
 * Ryuki Survive (2013)
 * Kamen Rider Faiz
 * Faiz Blaster (2013)
 * Kamen Rider Blade
 * Blade King (2013)
 * Kamen Rider Hibiki
 * Armed Hibiki (2013)
 * Kamen Rider Kabuto
 * Kabuto Hyper (2013)
 * Kamen Rider Den-O
 * Den-O Liner (2013)
 * Kamen Rider NEW Den-O
 * Kamen Rider Zeronos
 * Momotaros
 * Urataros
 * Kintaros
 * Ryutaros
 * Sieg
 * Deneb
 * Kamen Rider Kiva
 * Kiva Emperor (2013)
 * Kamen Rider Decade
 * Decade Complete (2013)
 * Kamen Rider Diend
 * Kamen Rider Double
 * Ganbaride
 * Televikun (Note: This toy gives off the call of the Joker and Cyclone Memories, Double's catchphrase, and the "Televikun Maximum Drive")
 * Kamen Rider OOO
 * OOO Putotyra Combo (2013)
 * Kamen Rider Fourze (2013)
 * Fourze Cosmic States (2013)
 * Kamen Rider Wizard (2013)

Wizard
The Gaia Memories, along with the other Rider Powers, were stolen from Double by Amadum in the world within the Magic Stone, who explained that they were already his due to the Riders' powers being from the same source as evil. However, the power was soon returned thanks to the appearance of Kamen Rider Gaim, with the return of the Memories immediately transforming Double into CycloneJokerXtreme.

Portrayal
The voice of the Gaia Memories is provided by Fumihiko Tachiki (立木 文彦), who is also the narrator of W.

Notes and Trivia

 * It seems that compatibility can greatly increase or decrease the being using the Gaia Memory`s powers as shown through the Joker, Cyclone, Skull, Eternal, Accel, and Utopia Memories.
 * The creation of Gaia Memory is very similar to the Materia from Final Fantasy VII,since both items are created from the knowledge from their respective planets.