Dopant

The Dopants are the fictional antagonists in the Kamen Rider Series Kamen Rider Double. Originally humans, they use mysterious USB memory sticks called Gaia Memories to assume monstrous forms, causing many crimes with the police force powerless to stop them. To transform, they press the Gaia Memory onto a USB port-like tattoo on their body. The name "Dopant" comes from the English word "dopant".

Magma
Magma Dopant (マグマドーパント, Maguma Dōpanto?) Having mysteriously disappeared, Yousuke Togawa reappears having the Magma Memory and the ability to transform into the Magma Dopant, targeting Windscale stores. After being defeated by Double, the Magma Memory is destroyed and Yousuke is attacked by the T-Rex Dopant.
 * Statistics
 * Identity: Yousuke Togawa
 * Gaia Memory: Magma Memory
 * Actor: YOH
 * Episodes: 1-2
 * Destroyed by: Kamen Rider Double CycloneJoker's Joker Extreme

T-Rex
T-Rex Dopant (ティーレックスドーパント, Tīrekkusu Dōpanto?) A Dopant that emerges from the ground and attacks Yousuke after he is defeated by Double.
 * Statistics
 * Gaia Memory: T-Rex Memory
 * Episodes: 1-2