|This article is about a/an villain in Kamen Rider W.|
Ikari (伊刈) is the primary Cockroach Gaia Memory user.
He is a sociopathic dōjinshi artist who runs the Dark Bug Exterminator website, a blog where people write down the names of those they want dead and he carries out the deed as the Cockroach Dopant (コックローチ・ドーパント Kokkurōchi Dōpanto), writing about his adventures in his self-published manga as the hero "Gokistar" (ゴキスター Gokisutā, portmanteau of "Cockroach" (ゴキブリ Gokiburi) and "star").
With his Dopant form's speed, he steals the Luna, Trigger, Heat, and Metal Memories from Kamen Rider Double. Ikari then decided to take the rest of Double's arsenal to become more powerful.
However, after Philip learns the Heaven's Tornado dance and uses it against the Cockroach Dopant, the Gaia Memories are retrieved, allowing for the Cockroach Memory to be destroyed by LunaTrigger's Trigger Full Burst Maximum Drive.
Other Cockroach Memory users
An unknown man hired by the Zenkuji family uses a Cockroach Memory and tries to fight Kamen Rider Double and Accel, though he loses.
A member of EXE, known as "C" (Ｃ（シー） Shī), possesses a Cockroach Memory. He transformed into the Cockroach Dopant to fight Shotaro as Kamen Rider Joker, though easily defeated by his Rider Kick.
However, he is revived in Kamen Rider × Super Sentai: Super Hero Taisen as a member of Dai-Shocker. The Dai-Shocker later revealed their alliance with Dai-Zangyack and battled an army of Kamen Riders and Super Sentai. He was seen fighting TimePink, GingaYellow, MagiBlue, and Kamen Rider 1, but his fate wasn't certain in the movie, or his human identity.
The Cockroach Dopant make an reappearance in Kamen Rider × Kamen Rider Wizard & Fourze: Movie War Ultimatum, as one of the revived members of the Monster Army that Wizard faced in his portion of the movie. He ran off when Poitrine finished off the grunts that had followed them.
- Main article: Cockroach Dopant
- Height : 220cm
- Weight : 138kg
As the Cockroach Dopant, his abilities include the ability to climb along walls and to move faster than oncoming attacks, much like a cockroach. Only Kamen Rider Double LunaTrigger's homing attacks are able to hit him.