Blue Thunder is the Stand of Koji Hirose, appearing in the JORGE JOESTAR light novel within its 37th Universe. It takes the humble shape of a little propeller and grants its user free flight along with gusts fierce enough to tear walls apart.
Rather than a looming figure, Blue Thunder manifests as a small propeller that sprouts from the top of Koji Hirose's head. Fans of Doraemon will recognize the resemblance, since the spinning blade calls to mind the flying gadget from that series.
The propeller lets Koji rise and move through the air with ease. Beyond simple flight, it can whip up wind powerful enough to knock walls clean out of buildings.

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Blue Thunder is the Stand of Koji Hirose, appearing in the JORGE JOESTAR light novel within its 37th Universe. It manifests as a small propeller that sprouts from the top of Koji's head rather than a looming humanoid figure.
Blue Thunder's propeller lets Koji Hirose rise and move through the air with ease, and it can also whip up wind powerful enough to knock walls clean out of buildings.
Blue Thunder resembles a small spinning propeller mounted on Koji Hirose's head, a design that calls to mind the flying gadget from the Doraemon series.
Koji Hirose is the only person shown wielding Blue Thunder, a Stand that appears solely in the prose of the JORGE JOESTAR light novel.
Blue Thunder appears exclusively in JORGE JOESTAR, a light novel set in the story's 37th Universe rather than in the main manga or anime continuity.
Looking for more on Blue Thunder? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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