Akane's widowed husband and Nagi's father figure. Initially distances himself from his family, blaming Nagi for his wife's death. Secretly maintains Akane's life support to contain Sadako, eventually revealing the truth to Fuko to help save Nagi.
The son of a previous film's character and Akane's supportive boyfriend. He is initially safe indoors when the video plays, but is abducted by a giant ghost projected from an LCD truck. Later, he is trapped inside a mobile phone at the abandoned mall's center until Akane trades herself for his life, freeing him to destroy the device.
Student experiencing terrifying visions, introduces the curse's psychological impact.
Wataru is encountered while investigating materials for a violin varnish and later tips Ryotaro and Kazuya off about the organization's base. He arrives as Kamen Rider Kiva during the climactic battle, turning the fight and joining Ryotaro in a Double Rider Kick.
Shingo Kasamachi is connected to the unresolved diary left by Minori Kōdai for Asa Takumi after high school graduation. He already knows that the diary exists, while Makio Kōdai struggles over whether Asa should receive it immediately. The available events establish his knowledge but not a fuller relationship.
Taisa Nakai is a person whom Yamano Yamame urgently warns after noticing a frightening woman in red near him. Soon afterward, Nakai is involved in a hit-and-run and suffers minor injuries, reinforcing the danger surrounding Yamame’s paranormal investigations. His incident becomes material for Yamame and Yuji Matsuo’s television ambitions.
Appears as a knowledgeable multiversal figure who explains the true nature of Kadoya sacrifice and the restoration of the multiverse through memory. He acts as a guide for Natsumi and Kaito, clarifying Kadoya purpose before the Riders return to their respective realities.
Archive voice of the vampire-themed Rider, appears in crossover cameos.
The central protagonist who attends high school and becomes Kamen Rider Kiva. He travels back to 1986 to prevent a prison escape that unleashes the Legendorgas. Throughout the film, he battles various monsters, confronts his father Otoya, and ultimately defeats the Legendorga Lord Arc in Emperor Form to save both timelines.
Kodaka is a second-year high school student who transferred to his new school about a month ago and has still not made any friends. The son of a Japanese father and a British mother, he is mistaken for a troubled kid because of his appearance. After discussing friendship with Yozora, he is forced to join the Neighbor's Club she forms.
Kazuma is Hana's husband and comes from a family of police officers, making his marriage a union between two opposing households. He travels with Hana and the family to Diebenburg, is caught in the castle trap, and later stands beside Hana when Rei threatens her, despite the conflict between their families.
A pitcher on the baseball club, Keiichirou throws seven innings and records nine strikeouts in a close loss. Discouraged, he tells Yuki Miyata he doubts the team can reach Koshien and worries he will not become a regular player. He later gives up pursuing a lineup spot and becomes the team’s manager, proposing ways to connect the club with other school groups.
Koji Seto has 48 screen credits in a career dating back to 2006. Their work spans 6 cinematic universes — most prominently Ring Collection with 2 titles. Signature works include Dollhouse, 119 Emergency Call, Sadako 3D 2. Explore the interactive character relationship maps on each title page to trace how their roles connect across franchises.
Universe traveler — spans 6 universes
Related entry on Wikidata (Q2271234), public domain (CC0).
