|This article is about a/an Dopant identity in Kamen Rider W.|
- Height: 195cm
- Weight: 98kg
As the Puppeteer Dopant (パペティアー・ドーパント Papetiā Dōpanto), the user uses special puppet strings to take control of whatever they wish and carries a flute that produces super-sonic waves.
- Main article: Keio Horinouchi
The main user of the Puppeteer Memory was Keio Horinouchi (堀之内 慶應 Horinouchi Keiō), a children's author who gained commercial success for his book The Girl and the Dollhouse (少女と人形の家 Shōjo to Ningyō no Ie) which he wrote to reflect his feelings for his daughter Rikako who died several months ago. He used the Puppeteer Dopant's power to take revenge against those who gave his book harsh criticism by controlling his daughter's doll, Riko, as the instrument of his vengeance. He particularally seeked revenge against those who claim he did not truly love his daughter. After being exposed, getting a new puppet in Wakana Sonozaki by Shinkuro Isaka, Horinouchi turned his attention towards Akiko Narumi before being defeated by Kamen Rider Double CycloneMetal's Metal Twister Maximum Drive.