Dopants

The Dopants (ドーパント) are the fictional antagonists in the Kamen Rider Series Kamen Rider Double. Dopants are normal humans who use Gaia Memories (ガイアメモリ), mysterious devices resembling USB flash drives that were originally created by Philip. But after he was taken from them, the Museum distributed the Gaia Memories to the highest bidder, allowing the buyers to assume monstrous forms. The Gaia Memory is inserted into a Living Connector (生体コネクタ), a tattoo on their body resembling a USB port, placed by a device called the L.C.O.G (Living Connector Setting Operation Gun) or Connect Shooter (コネクトシューター). Every Gaia Memory imbues a different power into its user; for example, animal-themed Dopants are able to transform into a gigantic version of the animal they are named after. However, this direct insertion without filtering the Gaia Memory's raw power will eventually drive the user insane. If there is no Living Connector (a Gaia Memory shared between people), the Gaia Memory will severely injure the user at the site of entry. This has given the Dopants their name from the English words "dopant" and "doping" (ドーピング). This effect can only be avoided through the use of a Memory Driver (メモリドライバー) belt, like the Sonozaki Family's Gaia Drivers or Kamen Rider Double's Double Driver. This distribution is meant to allow humanity to reach the next stage of evolution; filtering out the more corrupt adults in society by giving them Gaia Memories to use and abuse.

Every Gaia Memory (even those used by Double) is adorned with the first letter of the name of the Gaia Memory, stylized to resemble the subject of the Memory. 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. To defeat a Dopant, Kamen Rider Double uses one of his many Maximum Drive finishing attacks, resulting in the destruction of the Gaia Memory called a Memory Break (メモリブレイク). But if the Dopant does not have a Living Connector, the Gaia Memory will not break. The human is then left for the authorities.