Koji Hirose is a Stand user from the light novel JORGE JOESTAR, one of the allies Joji Joestar encounters in the 37th universe. He later lends a hand in tracking down Yoshikage Kira, relying on his flight-granting Stand, Blue Thunder.
Koji closely resembles Koichi Hirose of Diamond is Unbreakable, only a touch taller, and first shows up in a white button-up shirt. Once his Stand activates, a propeller sprouts from the top of his head.
His Stand, Blue Thunder, takes the simple form of a propeller fixed to his head, and its single purpose is to lift him into the air and let him fly.

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Yes, Koji Hirose has a Stand called Blue Thunder, which takes the form of a propeller fixed to his head and lets him fly.
Koji Hirose is a Stand user from the light novel JORGE JOESTAR, one of the allies Joji Joestar encounters in the story's 37th universe. He later helps in the search for Yoshikage Kira.
Koji Hirose's Stand, Blue Thunder, is a simple propeller that sprouts from the top of his head when activated. Its sole purpose is to lift him into the air and let him fly.
Koji Hirose closely resembles Koichi Hirose of Diamond is Unbreakable, only a touch taller, and first appears wearing a white button up shirt. Once his Stand activates, a propeller sprouts from the top of his head.
Koji Hirose helps Joji Joestar track down Yoshikage Kira after the two meet in the 37th universe, though the novel leaves much of his fuller background unwritten.
Looking for more on Koji Hirose? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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