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, Soichi Isurugi and Evolto, will use the Evol Driver alongside with the Evolbottles to transform and 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.

Personality
Ten years ago, Soichi was said to be a kind and caring person. However, upon his first exposure to the Pandora Box's energy, Soichi was transformed into a ruthless, cunning mastermind due to possession by Evolto.

It is later shown, however, that he is struggling for control, trying to fight back against Evolto, though these are vain attempts as Evolto has complete control over his body.

Devices

 * Transteam Gun - Blood Stalk's transformation device and personal weapon.
 * Fullbottles - Blood Stalk's transformation trinkets.
 * Evol-Driver - Evol's transformation device
 * Evolbottles - Evol's transformation trinkets
 * Evol Trigger - Evol's upgrade device for Black Hole form

Weapons

 * Steam Blade - Standard sidearm weapon. Can combine with the Transteam Gun to form the Steam Rifle.
 * Drill Crusher - Evol's personal weapon in Rabbit Form
 * Beat Closer - Evol's personal weapon in Dragon Form
 * Hawk Gatlinger - Weapon taken from Build

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, 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".