Star Platinum

Star Platinum is the Stand of Jotaro Kujo.

Jotaro awakens Star Platinum after DIO awakens his Stand due to their psychic connection. Jotaro uses Star Platinum to throw insanely fast and powerful punches.

At the end of Part 3, Star Platinum unlocks the time stop ability known as Star Platinum: The World, which follows the same rules as DIO's The World, allowing him to completely stop time for an extended period of time that ranges from part to part.

Physical Appearance
Star Platinum is a muscular built looking dude with purple skin. He's got long black flowing hair and looks like a dude.

Powers and Abilities
Star Platinum is a close-range Stand with a range of two meters.

With his Stand, he is able to throw incredibly fast punches. Star Platinum is known for its speed, which allows him to take hold of bullets that get shot at him point blank.

At the end of Part 3, Jotaro realizes that Star Platinum and DIO's Stand, The World, are the same type of Stand, meaning that Star Platinum has the ability to temporarily stop time.

Genesis of the Universe

 * Chapter 1: One-Way Trip From the Desert to Hell City
 * Chapter 2: The Gravestone of Red-Hot Sand

Part 6: Stone Ocean

 * Episode 3: The Visitor, Part 1
 * Episode 4: The Visitor, Part 2
 * Episode 5: Prisoner of Love
 * Episode 8: Foo Fighters (DISC only)
 * Episode 9: Marilyn Manson, the Debt Collector (DISC)
 * Episode 10: Savage Garden Strategy (Head for the Courtyard!), Part 1 (DISC)
 * Episode 12: Torrential Downpour Warning (DISC)
 * Chapter 75: Father: Jotaro Kujo, Daughter: Jolyne Cujoh
 * Chapter 147: C-Moon, Part 7
 * Chapter 148: C-Moon, Part 8
 * Chapter 150: Made in Heaven, Part 2
 * Chapter 151: Made in Heaven, Part 3
 * Chapter 152: Made in Heaven, Part 4
 * Chapter 153: Made in Heaven, Part 5
 * Chapter 154: Made in Heaven, Part 6 (death)

Trivia

 * Some people theorize that Star Platinum may be the spirit of Jonathan Joestar helping out his great-great-great grandson in battle due to his design slightly resembling him.
 * Obviously this isn't true because not only is that not how Stands work but that's also not how dying works. People also really like to point out some sub from an episode of Part 1 where Jonathan says to Dio, "If I die my ghost will haunt you" which is also bs.
 * This is the first Stand to follow along with a naming-scheme that the next JoJo's Stands all follow, that being being named after a material. In this case, it's platinum.