Jumpin' Jack Flash is a humanoid Stand of a height and build similar to Lang Rangler's. A dark band circles its head at the height of its eyes; and its chest bears the debossed, cartoonish impression of a rocket ship.
At its wrists are roughly spherical cages or rotating parts that can turn at high speed and launch various projectiles.
Jumpin' Jack Flash is grey and orange in the colored manga.
Jumpin' Jack Flash is a powerful Stand relying on its crippling power of gravity removal to disable its victims and then harass them from afar until they die by themselves from the deadly environment they create.
It is considerably dangerous and nearly impossible to defend against once set up. Only the cooperation of Weather Report's versatile power (which by itself could only temporarily counter its effects) and Jolyne's Stone Free could the two Stand Users defeat Lang Rangler.
If Lang Rangler spits on someone, the victim becomes the center of a zero-gravity environment.
Being spat on by Lang Rangler causes the victim to stop being subject to gravity as well as anything or anyone they touch.
The sudden loss of gravity is crippling for the victims who are guaranteed to be disoriented. However, the most dangerous property of Jumpin' Jack Flash is that its power creates a chain reaction that causes the air in the nearby vicinity to become weightless. It eventually creates a vacuum of about 20 meters around the victim that threatens to suck away their blood from any wound and eventually causes the boiling of the bloodsteam long before suffocation sets in. In the vacuum, anything containing air becomes a potential explosive, which Lang uses to his advantage to propel shrapnel of various objects into his enemies. This vacuum is dangerous both for the victims and Lang, who must stay away from the victim.
Lang Rangler can freely toggle the weightlessness of particular objects and people.
Jumpin' Jack Flash is armed with two centrifuges on each wrist that can store small objects such as screws and bolts and then turn at high speed, accumulating centrifugal energy inside the objects before launching them at enemies as bullets. The use of physical objects as ammunition means that Lang needs to reload them regularly.
Lang uses the centrifuges in conjunction with the vacuum the victims create around them to slightly wound them and accelerate the blood loss. He is adept at shooting with the centrifuges and can even use rebounds to bypass defenses
Lang Rangler can also summon the centrifuges directly on his wrists.
Chapters in order of appearance
- Araki thought it wasn't really necessary to have the Stand remotely controlled, so it became like a suit partway through.