Katsuya Kobayashi is a Japanese actor, voice actor, and disc jockey known professionally by the stage name KORBY. He was born on March 27, 1941, in Hiroshima, Japan. His career is notable for its跨度 across live-action film and television, anime voice acting, and a long-standing presence as a radio personality.

Kobayashi's career began in the early 1980s. A significant part of his professional identity is his work as a disc jockey, most famously as the long-time host of the television music program Best Hit USA, which he began presenting in 1981. This role capitalized on his self-taught English skills, allowing him to interview numerous international artists. In the realm of voice acting, he is recognized for his work in both anime and tokusatsu. One of his earlier anime voice roles was as DJ Bill in the 1984 science fiction film Lensman, an adaptation of E. E. Smith's novel. This directly confirms the role mentioned in the query.

Beyond this, Kobayashi has an extensive list of acting credits in live-action films and television dramas spanning several decades. In the 2010s, he became a prominent voice presence in the Kamen Rider franchise. He provided the voice for the Build Driver and related transformation devices in the popular series Kamen Rider Build (2017-2018) and its subsequent film adaptations. He also voiced the Kamen Rider Build Gashat in Kamen Rider Ex-Aid.

His other notable acting appearances include roles in films such as Rent-a-Cat (2012) and The Great War of Archimedes (2019), and in television dramas like Mr. Brain (2009) and The Eternal Zero (2015). His work demonstrates a versatile talent that has remained active in the Japanese entertainment industry for over four decades.