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Acting
KORBY or Katsuya Kobayashi is a Japanese voice actor, disc jockey and narrator. He provided the voice of the Build Driver and Nebulasteam Gun in Kamen Rider Build. He also provided the voice of the Kamen Rider Build Gashat. He was also the chorus of the New Kamen Rider song Kagayake! Hachinin Rider, which was the theme of Eight Riders vs. Galaxy King and the second ending of the show.

One Day in Shimokitazawa
as Katsuya

The Great War of Archimedes
as Mineo Osumi

Kamen Rider Build NEW WORLD: Kamen Rider Cross-Z
as Build Driver (voice)

Kamen Rider Prime Rogue
as Build Driver (voice)

Kamen Rider Build The Movie: Be The One
as Build Driver (voice) (uncredited)

Kamen Rider Build: Birth! Bear Televi!! VS Kamen Rider Grease!
as Build Driver (voice)

Kamen Rider Build: Raising the Hazard Level ~7 Best Matches~
as Build Driver (voice)

Kamen Rider Heisei Generations FINAL: Build & Ex-Aid with Legend Riders
as Build Driver (voice)

Home Sweet Tokyo
as Sawa Hiroyuki

Ramen Heads
as Self

Kamen Rider Build
as Build Driver / Nebulasteam Gun / Genius Fullbottle (voice)

Kamen Rider Build: Transformation Lessons ~The Laws Of Transformation Are Set!~
as Transteam Gun Voice

Rent-a-Cat
as Sayoko's Neighbour

Little DJ
as Makoto Ozaki

Olfactogram

A Class to Remember III: The New Voyage
as Murakami

Welcome Back For An Extracurricular Lesson, Sempai
as Self

Woman in Witness Protection
as Film Director
Futari no Shiso Gemu

Futari no Shiso Gemu

Salaryman Senka
as Shachou

Reiko, Sister of the Mob
as Masataka Otake

The Man With No Name

Taro! Momotaro in Trouble

Super Rescue Solbrain
as Seiichi Kasahara

Who Do I Choose?
as Kitabayashi

Blue Blink
as Tanba (voice)

Revolver
as Yasuo Akune

Youjo Melon
as MC on stage/a ninja on TV

The Crazy Family
as Katsuhiko Kobayashi

Lensman
as DJ Bill (voice)

Fifth Movement

Kamen Rider
as Build Driver (voice)