Soichi Isurugi

Soichi Isurugi (石動 惣一) is the father of Misora Isurugi, the owner of the café nascita and also the host of Evolto.

Later, Evolto, in Soichi's body, uses the Evol-Driver to become Kamen Rider Evol.

Early Life
Ten years prior to the events of Build, Soichi was an astronaut working with the Kiwami Project, discovering the Pandora Box on Mars. However finding the box would change his mentality, which he jokingly admitted that it "did a number on his mind". In truth, it was Evolto who had somehow possessed Soichi's body and fled with him to Earth, unknown to anyone.

Release from Evolto
When Evolto initiated "Phase 2" of his ultimate plan and possessed Ryuga Banjo, Soichi was left unconscious and taken to a hospital by Sawa and Kazumi. After the Evol-Trigger was repaired and regained his Black Hole form, Evolto (now a corporeal shape-shifter) would later assuming Soichi's appearance.

Personality
Ten years ago, Soichi was said to be a kind and caring person, as shown when he reads to his young daughter Misora Isurugi, remembering all the things she liked. However when he returned to Earth with Pandora's Box, he was possessed by Evolto. During his possession, Soichi was constantly struggling for control of his own body, although his attempts were in vain.

Forms
Evol-Driver=

Devices

 * Transteam Gun - Blood Stalk's transformation device and personal weapon. Evol inherits it as his personal weapon
 * Fullbottles - Blood Stalk's transformation trinkets. Used by Evol to summon weapons and perform finishers.
 * Evol-Driver - Evol's transformation device
 * Evolbottles - Evol's transformation trinkets
 * Evol Trigger - Evol's upgrade device for Black Hole form

Weapons

 * Steam Blade - Blood Stalk's standard sidearm weapon. Can combine with the Transteam Gun to form the Steam Rifle. Continued to be used by Evol.
 * Drill Crusher - Evol's personal weapon in Rabbit Form
 * Hawk Gatlinger - Evol's weapon granted by the Gatling Fullbottle

Portrayal
Soichi is portrayed by Yasuyuki Maekawa (前川 泰之). As Evolto, his other voice was voiced by Tetsuo Kanao (金尾 哲夫), who previously voiced Namakelder in Happiness Charge Pretty Cure!. As Blood Stalk and Kamen Rider Evol, his suit actor is Kazuya Okada (岡田 和也).

Etymology
The katakana "sutāku" (スターク) in his name is usually translated as "Stark".