Jonathan Joestar/Abilities and Powers

Athletic Ability
Jonathan had lived a rough past as the son of an aristocrat, and was known in his childhood to have been at least a competent boxer. In his college life, he is shown to have played American Football alongside Dio Brando, and was revered as one of the two stars of Hugh Hudson Academy.

Ripple
Jonathan has an arsenal of ancient martial art techniques, most inherited from Will A. Zeppeli and involving the Ripple, at his disposal. Some are his original creation, each ending with "Overdrive".

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 * Zoom Punch
 * Sendo Ripple Overdrive
 * Scarlet Overdrive 
 * Underwater Turqoise Blue Overdrive 
 * Overdrive Barrage
 * Metal Silver Overdrive
 * Life Magnetism Overdrive

His most memorable is his final attack: "Furueru zo haato! (My shivering heart!) Moetsukiru hodo hiito! (And this burning heat!) Kisamu zo, ketsueki no biito! (Slice him, beat of my blood!) SUNLIGHT YELLOW OVERDRIVE!"

Weapons

 * Luck and Pluck: After his defeat, Bruford gives Jonathan his sword. Jonathan is able to fuse it with the ripple during his battle with Dio.

Stand
Though Jonathan did not have a stand while he was alive, his corpse was taken over by Dio Brando after his death and pierced with the Stand-creating Arrow. This awakens a stand similar to Hermit Purple in his body, which Dio uses to track the Joestars and their friends in Part III: Stardust Crusaders.