Koshiro Igarashi

This article is about an ally in Kamen Rider Revice.

Koshiro Igarashi
Gender	Male
Ally Type	Family
Affiliation	Happy Spa Igarashi Family
Homeworld	Earth
Series	Kamen Rider Revice
First Appearance	Kamen Rider Geats × Revice: Movie Battle Royale
Latest Appearance	Kamen Rider Geats × Revice: Movie Battle Royale
Number of Episode Appearances	1 (Movie) Full list of appearances
Actor	Kiku

Koshiro Igarashi (五十嵐 幸四郎, Igarashi Kōshirō) is the youngest child and son of the Igarashi siblings. He appears exclusively in Kamen Rider Geats × Revice: Movie Battle Royale.

History

Koshiro in Movie Battle Royale.

Koshiro Igarashi is fourth-born child of Genta and Yukimi Igarashi, and the youngest brother to Ikki, Daiji and Sakura. He was born approximately nine months after Ikki and Vice's final battle.

Powers

• Giff's Offspring Physiology: Like his siblings, Koshiro is infused with Giff's DNA from birth.
• Inner Demon Control: As a side effect of inheriting Giff's genes, Koshiro is born with an inner devil with its own unique appearance. He also has the potential to keep his inner demon under control.

Relationships

Family

Ikki Igarashi
Eldest brother

Daiji Igarashi
Elder brother

Sakura Igarashi
Elder sister

Yukimi Igarashi
Mother

Genta Igarashi
Father

Unnamed grandparents
(both deceased)

Giff
Genetic relative

• Koshiro Igarashi's Inner Demon: Koshiro's inner demon following Vice with Ikki, Kagero with Daiji & Lovekov with Sakura.

Behind the Scenes

Portrayal

Koshiro Igarashi is portrayed by Kiku (掬, Kiku).

Etymology

• Like the rest of his family, the Igarashi surname contains the kanji for "fifty" (五十嵐), which is likely a nod to Revice commemorating the 50th anniversary of the Kamen Rider franchise.
• Koshiro's first name (幸四郎) contains the kanji for "four", referencing his status as the fourth-born child of the Igarashis.

Notes

• The idea of a fourth Igarashi child was conceived by producer Taku Mochizuki that came up with during a chat with Hanta Kinoshita, who expressed some doubts but was nonetheless surprised with the results.

Appearances

• Kamen Rider Revice
  • Kamen Rider Geats × Revice: Movie Battle Royale