From "Kamen Rider Double"

Puppeteer Dopant:http://i231.photobucket.com/albums/ee121/Kainsword17/Dopants/Puppet-Dopant.jpg

Keio Horinouchi is a children's author who has gained commercial success for his book The Girl and the Dollhouse which he wrote to reflect his feelings for his daughter Rikako who died several months ago. As the Puppeteer Dopant, he uses special puppet strings to take control of whatever he wishes and carries a flute that produces super-sonic waves. He uses these powers to take revenge against those who give his book harsh criticism by controlling his daughter's doll, Riko, as the instrument of his vengeance. After being exposed, getting a new puppet in Wakana by Isaka, Horinouchi turns his attention towards Akiko before being defeated by Kamen Rider Double CycloneMetal's Metal Twister Maximum Drive.

©Toei