Kamen Rider

Bugster Union

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This article is about a/an monster in Kamen Rider Ex-Aid.
Bugster Union
Series: Kamen Rider Ex-Aid
Motif: Virus
Affiliation: Bugsters
Height: Various cm
Weight: Various kg
First Appearance: I'm a Kamen Rider!
Number of Episode
TBA (Ex-Aid)
Full list of appearances

A Bugster Union (バグスターユニオン Bagusutā Yunion) is the monster form of a Bugster-infected patient when the virus first flares up.


Bugster Unions are formed when a Bugster-infected patient experiences enough stress, the Bugster viruses inside multiplying rapidly and overtaking the patient's body, forming a giant orange virus form around it; the Union's shape seems largely irrelevant to the Bugster's appearance. Bugster Unions can only be defeated by a Kamen Rider in Level 1; the reason why is unexplained, though it may be because other Levels are too strong and may injure the patient inside the Union.

The Bugster Union stage is bypassed for Bugsters in Level 3 or more .


Salty Bugster Union

I'm a Kamen Rider!

Aranbura Bugster Union

Another Prodigy with No Thank You?

Revol Bugster Union

BANG, That Jerk is Coming!

Motors Bugster Union

An Operation Called Dash!

DoReMiFa Collabos Bugster Union

A Hollow Beating in the Heart!

Giri Giri/Jet Collabos Bugster Union

The Reason for Some Lies!

Hunter Gamer Union

Beat Up the Dragon!


Behind the Scenes

Like most giant monster forms, all Bugster Unions are completely CGI. Likely as a result and to minimize the budget, Bugster Union battles are often short or the audience is given only a limited view of the action to reduce the Unions' onscreen time.


  • It's unknown how Ex-Aid was able to defeat the Dragon Bugster Union in Level 2 when Asuna Karino stated that a Kamen Rider can only defeat a Bugster Union in Level 1, though because it separated from the infected patient instead of consuming them, it may have been a different type of Union.
    • Alternatively, only defeating a Union in Level 1 may have been because stronger forms would risk injuring the patient trapped inside, and since the Dragon Union had no patient inside, there was no risk.



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