Foundation X

Foundation X (財団Ｘ) is an underground research organization focusing on illegal projects with phenomenal energetic potentials. The massive projects they focus would provide in return immeasurable profit and research data from sponsoring different organizations to their respective project. They first debut in Kamen Rider W, sponsoring the Musuem for their Gaia Memory research, involving the investigating the true Gaia Memory and the artificial Gaia Memories. After Ryubee Sonozaki dies, the foundation takes over the Gaia Impact project.

But after the death of Jun Kazu, Foundation X cancels all Gaia Memory research to focus on other prospective projects, such as the O Medals and later the Cosmic Energy research of Mitsuaki Gamo. Foundation X is also known for creating Dummy Kaijin, which are kaijin that resemble and hold the powers of the kaijin they represent, but are actually manifestations of Gaia Memories, Medals, or Cosmic Energy.

Appearance
All members of Foundation X wear white business suits, classifying them as both researchers and business merchants of death (死の商人).

W
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Fourze
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Members

 * Jun Kazu (加頭 順) was a valuable Foundation X member who was a Quark/Necro-Over hybrid, and the Utopia Dopant, the final major antagonist of Kamen Rider W.
 * Tabata (田端) is a researcher from Foundation X who picks up the T2 Gaia Memories from Kazu to take to the Foundation's headquarters in episode 44 of Kamen Rider W. However, as revealed in the opening of Kamen Rider W Forever: A to Z/The Gaia Memories of Fate, he is attacked en route in a helicopter to Foundation X's headquarters by Katsumi Daido who takes the T2 Eternal Memory as he escapes death when Tabata activated the suitcase's self destruct, killing himself as the helicopter explodes and the other T2 Gaia Memories spread throughout Futo.
 * Neon Ulsland (ネオン・ウルスランド) is the woman in charge of Foundation X, usually researching Foundation X reports about unusual events or artifacts, such as NEVER or the O Medals, which are graded from A, B, C, D, or F. She is often seen with a stopwatch, as she is very strict when it comes to keeping schedules. She is shown to check her stopwatch frequently and doing strict allocations of time for matters, even interrupting others' talking and not sparing even a second more, should it affect her schedule. After Jun Kazu's defeat, she officially decides to end the foundation's Gaia Memory research.
 * Doctor Prospect (ドクター・プロスペクト) was a Foundation X scientist studying the use of psychic ability and created an army of psychic-powered soldiers known as Quarks (クオークス). He can transform into the Eyes Dopant (アイズ・ドーパント) and is the main antagonist in Kamen Rider W Returns: Kamen Rider Eternal.
 * Lloyd (ロイド) was one of Doctor Prospect's Quarks bodyguards before he was killed off by Gozo Domoto.
 * Shion (シオン) was one of Doctor Prospect's Quarks bodyguards before she was killed off by Kyosui Izumi.
 * Lem Kannagi (レム・カンナギ) was a Foundation X researcher who, before the events of Kamen Rider × Kamen Rider Fourze & OOO: Movie War Mega Max, he was known throughout Foundation X for successfully creating the Super Evolved Lifeform Mutamids. He then was granted funding for researching the time anomaly and SOLU that crashed to Earth, and created the GingaOh driver using Kamen Rider Poseidon's Core Medals, and the SOLU Switch created from the SOLU that had become Nadeshiko Misaki. However, he betrayed his supervisor and all of Foundation X, and revealed his intention to use the GingaOh Driver to rule not only the Earth, but the entire galaxy as the Super Galaxy King (超銀河王). He was destroyed, as the Super Galaxy King by the combination of OOO's Super TaToBa Kick and Fourze's Double Rocket Drill Kick
 * Katal (カタル) is one of Lem Kannagi's subordinates. Foundation X experiments have turned him into a Mutamit known as Suddendath (サドンダス), who resembles a dragon with a breath weapon of bright blue energy. Katal fight Kamen Rider Fourze and the Kamen Rider Club before meeting his end at the hands of Kamen Rider Fourze Rocket States's Rider Tailspin Crusher. Katal's Mutamit form Suddendath is based on the design of Suddendass of the Skyrider movie.
 * Solaris (ソラリス) is one of Lem Kannagi's subordinates. She has also been transformed into a Mutamit by Foundation X who demonstrates catlike abilities without transforming, but never transforms into full Mutamit form. Instead she utilizes a Zodiarts Switch to become a copy of the Unicorn Zodiarts. She is defeated by Kamen Rider Double CycloneJokerXtreme.
 * Chancellor Kiima (キイマ総統官) is Lem Kannagi's superior in Foundation X. She is killed by Kannagi after his agenda to take over the world is exposed.
 * Female Executive Member of Foundation X (財団X女性幹部)
 * Callas (カラス) was Foundation X's scientist that was originally named Susumu Karashima (辛島 進).
 * Canaria (カナリア) was Foundation X's scientist originally named Rie Kanai (叶井 梨絵).