Ten years prior to the events of Build, Isurugi 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". At the ceremony back on Earth, he rushed the security guards and applied his hand to the Pandora Box, causing the Sky Wall Disaster. After a series of later psychological attempts, Soichi was arrested and placed in a mental hospital, but he escaped about a month later. Around the same time he was admitted into the hospital, Misora Isurugi was also admitted as well due to the exposure of the box's affects and gained the ability to purify Fullbottles. At some point he opened up a café called nascita in Touto.
Publication Information
- Build : Soichi Isurugi
- Japanese : 石動 惣一
- Version : Kamen Rider Build
- Alter Ego : Blood Stalk
- Known as :
- Type :
- Affiliation :
- Relative : Misora Isurugi : Daughter
- Gender : Male
- Origin : Earth (World Of Build)
- Season : Kamen Rider Build
- First Appeareance : Kamen Rider Build Episod 1 : That One with the Best Match
- Last Appeareance :
- Number of Appeareance :
- Potrayer : Yasuyuki Maekawa (Soichi Isurugi)
- Voice Actor : Tetsuo Kanao (Evolto)
- Main View : Full Episod
Isurugi, as Blood Stalk, made contact with Sento shortly after Sento defeated Masahiro Nabeshima as the Mirage Smash by stabbing him in the back with a venomous tentacle, leaving him stunned. Stalk then used a giant projection of a cobra to retrieve the incapacitated Nabeshima. Gentoku Himuro seems to be aware of Blood Stalk's activity.
Returning to Earth
To Be Added
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 would later assuming Soichi's appearance.
Abilities:
- Computer Proficiency : Isurugi has some level of programming knowledge, as he was able to hack the GPS on a stolen motorcycle, and stolen Sclashjellies data from Sento's computer.
- Altered Physiology : Being the first human to be exposed to the Pandora Box, Soichi has demonstrated numerous superhuman abilities since his return from Mars.
- Matter Reshaping : Isurugi was able to manipulate a tablet computer into a rod shaped item that he used as a back scratcher.
- Superhuman Agility : Isurugi was shown to be able to leap at a scale far beyond human capacity after his battle with Build's RabbitTank Sparkling Form.
- Identity Manipulation : Using a cloud of steam from his hand, he can make anyone's face look like anyone else's; the process seems painful to those who are awake to feel its effects. While the permanence of the change is yet unclear, certain individuals have been shown to retain their new identities for more than a year. Initially thought to be an ability of the Blood Stalk system, this power has since been revealed to be a power gained from Soichi's time on Mars.
- Memory Manipulation : Soichi has shown the ability to erase the memories of others with nothing more than a touch of his hand. Unlike the amnesia induced by Nebula Gas, Soichi's memory manipulation is shown to be complete, causing a total wipe of the person's previous identity. However, with time, some victims have shown to be able to recover partial memories, skills, or even the entirety of their past given proper circumstances.
- Hazard Level 3+: As a user of Transteam Gun, it seems that Soichi has a high Hazard Level that allows him to use such device. As Stalk, Soichi mentions that his and Gentoku's Hazard Level are at the same level and would stay the same due to the Transteam System being incapable of rising them.
- Dagger Proficiency : Although a very subtle example, Soichi is capable of throwing knives at a high precision rate.
Blood Stalk
- Main Articles : Blood Stalk Forms, Weapons, Powers and Abilities
- Origin : Earth (World Of Build)
- Version : Kamen Rider Build Series
- Type : Riders
- Users : Soichi Isurugi
- Announcement : Cobra! Mistmatch! Co-Cobra... Cobra... Fire!
- Height : 201.5 cm
- Weight : 102.0 kg
- Punching power : 19.0 t
- Kicking power : 22.7 t
- Maximum jump height : 40.0 m
- Maximum running speed : 100 m. per 4.7 sec.
- Appearances : Build Episodes 3-14, 16
- Voice Actor : Tetsuo Kanao
- Similar to Night Rogue, Blood Stalk accesses his main form with the Transteam Gun and the Cobra Fullbottle. His stats are not only stronger than most of Build's forms, but also surpass Night Rogue's with only speed being slightly lower than his. Stalk also possesses numerous abilities in this form, such as being able to utilize a tentacle to inject venom into a human and either paralyze or kill them.
- Main Articles : Blood Stalk Forms, Weapons, Powers and Abilities
