This article is about a/an monster in Kamen Rider Ex-Aid.
Kaiden Bugster
Series: Kamen Rider Ex-Aid
Motif: Video Game
Japanese Samurai
Japanese Dragon
Samurai Games
Affiliation: Bugsters
Height: 207.1 cm
Weight: 126.3 kg
First Appearance: Chasing the Mystery!
Number of Episode
TBA (Ex-Aid)
Full list of appearances
Actor: Otoya Kawano
Taro Suwa ("Heiji Uesugi")

Kaiden Bugster (カイデンバグスター Kaiden Bagusutā) is the monster born from data of the samurai-themed video game, Giri Giri Chambara.

Character HistoryEdit

Kaiden emerged from Detective Heiji Uesugi due to his stress at not being able to solve the case of Zero Day, which had caused the death of his son. Kaiden duels Brave Hunter Quest Gamer Level 5 Full Dragon and Ex-Aid Double Action Gamer Level X in a sword fight, getting weakened by hits Drago Knight and Mighty Double Critical Strikes and retreating back inside of Heiji.

He reemerges when Heiji again feels ashamed of his lack of progress on the case, fighting Brave Level 5 Full Dragon, but this time being defeated by a slash from Drago Knight Critical Strike. His debris are collected by Kuroto with the Gashacon Bugvisor. Chasing the Mystery!


Kaiden acts like a highly skilled and well-seasoned samurai, challenging his opponents to sword duels while touting his own skill.


File:Bugster (Bacteria).png

The Bugsters originate as the microscopic Bugster Virus (バグスターウイルス Bagusutā Uirusu), a result of humans being contaminated by the Bugster, thus developing the condition known as the Game Disease (ゲーム病 Gēmu-byō).

File:KREA-Kaiden Bugsterl30.png

Kaiden's main form. Like other Level 30 Bugsters, it overtakes the host's form when they become stressed enough.

Appearances: Ex-Aid Episodes 21

Powers and AbilitiesEdit

Kaiden is armed with a pair of long swords, and uses them with expert skill, having a particularly fast slashing technique.

Behind the ScenesEdit


to be added


"Kaiden" is an abbreviation of "Menkyo Kaiden" (免許皆伝), refers to the permission of education system for semi practitioners of various Japanese classical martial arts and ways.


  • Being born directly from Giri Giri Chambara, the three Bugsters that use the Giri Giri Chambara Rider Gashat receive their katana and chest armor from this Bugster. Unlike Kaiden, their capes were colored silver instead of red.
  • Kaiden Bugster has an oni face design on his hat just like the oni faces on the Hibiki Riders' helmets.


See AlsoEdit


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