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Ryubee Sonozaki is the head of the Sonozaki Family and the Museum organization, and the main antagonist of the Kamen Rider Double series.

Ryubee uses the Terror Memory and a special Driver to become the Terror Dopant.

He is played by Minori Terada, who also voiced Colonel Muska in Castle in the Sky.


Ryubee and his wife were responsible for creating the devices called Gaia Memories, which allow a person to transform into a monster called a Dopant by accessing the memories of the planet. However, the Gaia Memories proved addictive, with prolonged use causing mental damage. They also created the Double Driver and Lost Driver, which allow a user to transform into Kamen Riders with Gaia Memories without the risk of addiction or bodily harm.

His wife, Fumine, left him after the death of their son, Raito. He carried on his research, and distributed Gaia Memories in secret to the people of Fuuto City, to observe their effects on the human body. Each of these Dopants was defeated by Kamen Rider Double, and later Kamen Rider Accel.

After adequate research from his Dopants, and observing Kamen Rider Double, he chose his daughter Wakana, to become one with the Earth's knowledge by way of an event called the Gaia Impact. Before he can do this, he is defeated by Kamen Rider Double and Kamen Rider Accel, and dies as his home burns around him. At the end of the series, his soul appeared in front of Phyllip, alongside other deceased members of Sonozaki Family, to say goodbye to Phyllip before moving on. 



           W Title.pngVillains

Museum/Sonozaki Family
Ryubee Sonozaki | Saeko Sonozaki | Wakana Sonozaki | Kirihiko Sudo | Mick | Shinkuro Isaka | Masquerade Dopants

Foundation X
Neon Ulsland | Jun Kazu | Tabata | Doctor Prospect | Lloyd | Shion

Katsumi Daido | Jun Kazu | Maria S. Cranberry | Kyosui Izumi | Reika Hanehara | Ken Ashihara | Gozo Domoto

Shiro Endo | Energy

Magma Dopant | T-Rex Dopant | Money Dopant | Anomalocaris Dopant | Cockroach Dopant | Sweets Dopant | Virus Dopant | Violence Dopant | Masquerade Dopants | Arms Dopant | Bird Dopant | Ice Age Dopant | Triceratops Dopant | Liar Dopant | Dummy Dopant | Puppeteer Dopant | Invisible Dopant | Nightmare Dopant | Beast Dopant | Zone Dopant | Yesterday Dopant | Quetzalcoatlus Dopant | Hopper Dopant | Gene Dopant | Jewel Dopant | Old Dopant | Energy Dopant | Oyakodon Dopant | Bat Dopant | Spider Dopant | Commander Dopant | Death Dopant

           Fourze Logo.png Villains

Horoscopes: Sagittarius Zodiarts | Virgo Zodiarts | Libra Zodiarts | Leo Zodiarts | Scorpion Zodiarts | Cancer Zodiarts | Aries Zodiarts | Capricorn Zodiarts | Aquarius Zodiarts | Taurus Zodiarts | Gemini Zodiarts | Pisces Zodiarts
Other Zodiarts: Orion Zodiarts | Chamelon Zodiarts | Unicorn Zodiarts | Hound Zodiarts | Altar Zodiarts | Pyxis Zodiarts | Perseus Zodiarts | Canis Minor Zodiarts | Lynx Zodiarts | Dragon Zodiarts | Pegasus Zodiarts | Cygnus Zodiarts | Coma Zodiarts | Musca Zodiarts | Lepus Zodiarts | Lyra Zodiarts | Hercules Zodiarts
Others: Stardust Ninja Dustards

Foundation X
Lem Kannagi | Katal | Solaris | Kiima | Masquerade Dopants | Waste Yummies | Stardust Ninja Dustards
Dummy Inhumanoids: Terror Dopant | Claydoll Dopant | R Nasca Dopant | Smilodon Dopant | Uva | Kazari | Gamel | Mezool

Space Ironmen Kyodain
Groundain | Skydain

Monster League
Saburo Kazeta | Rumi Komaki | Daita Kondou | Chikao Nezu

Xatan | Eel | Gahra