Star Platinum is a close-range Stand with exceptional strength and speed, as well as gaining the ability to stop time during the fight against DIO. Its overwhelming power, coupled with Jotaro's fighting prowess, make it one of the strongest and most iconic Stands in the series.
Star Platinum is a humanoid Stand, resembling a tall, well-built man of similar proportions to Jotaro, if not more muscular. In colored art, its skin is often a hue between purple, blue, green, and small bits of gold. Its face and body have varying colors.
It has long, flowing hair with a darker shade above its eyes and on the bridge of its nose, blurring the distinction between its hair and head. The spaces under its eyes and on its cheeks and chin are a darker color and divided clearly from the space around its nose and mouth. It wears a cap on its chin, and a metallic headband in three pieces, the central piece of which is shaped as a vertical ellipse. Initially, its facial features were very similar to Jotaro's.
A wavy line runs from each arm to the front of its torso, continuing down its legs. It has a minimal range of clothing and armor, including a short, circular scarf, shoulder pads with a spiral design, long gloves with studs on the back, knee and elbow guards, a loincloth, and short boots (which became knee-length as of Part 6).
Star Platinum was designed to look like a guardian spirit. Its shoulder pads resemble the ones worn in Fist of the North Star. The spiral patterns symbolize the Ripple and the concept of infinity.
The series is known for alternating colors between media, the information presented below may or may not be canon.
(Purple and indigo, with a gray jaw, cheeks, and ears.)
Hair(Dark purple with purple highlights.)
(Golden armor and crown, yellow scarf, dark purple gloves, wrappings, and boots, white loincloth.)
Skin(Gray and purple)
(Golden armor and crown, gray gloves and elbowpads, purple scarf, wrappings, and loincloth.)
(Light blue and blue, with a purple and black chest)
Hair(Black with green highlights)
(Golden armor, ears, chinpeice, and crown with a magenta jewel, brown gloves and wrappings, white scarf and loincloth.)
(Light Green and teal, with a green jaw and cheeks.)
(Golden armor and crown, yellow scarf, black gloves, wrappings, and boots.)
Skin(Green, with a yellow jaw and cheeks)
(Golden armor and crown, yellow scarf, lavender gloves, wrappings, and boots, white loincloth.)
(Purple, with a dark purple jaw and cheeks.)
(Golden armor and crown with a silver jewel, red scarf, black gloves, wrappings, and boots with yellow stripes, white loincloth and kneepads.)
(Golden armor and crown, red-orange scarf, dark green gloves, wrappings, and boots, white loincloth and kneepads.)
Skin(Cyan and lavender)
(Golden armor, chinpiece, and crown with a silver jewel, white scarf, gloves, wrappings, loincloth, and boots.)
Skin(Teal and purple)
Body stripes(Dull Gold)
(Golden armor, chinpiece, and crown, white scarf, gloves, wrappings, loincloth, and boots.)
Skin(Purple, with a dark purple jaw)
(Golden armor and crown with a silver jewel, purple scarf, dark blue gloves, wrappings, white boots with light blue stripes, white loincloth and kneepads.)
Despite not having a consciousness of its own, Jotaro has described Star Platinum as very violent. It is silent, except when it throws punches, during which it cries"ORAORAORA!" loudly and repeatedly. With a relatively human face, it may show hints of emotion by scowling and smiling.
Star Platinum does demonstrate a sense of self-preservation, as seen when it halts a bullet Jotaro experimentally shoots at his own head, protects an incapacitated Jotaro from DIO's attacks during Time Stop, and revives him from near-death by directly pumping his heart (however, considering Star Platinum's pioneering role in the series, this capacity may speak primarily to the metaphysical or subconscious qualities of Stand users).
In the original manga, Star Platinum, early on, is seen with a wide, disconcerting smile. Later on, Star Platinum gains Jotaro's stoic visage, with its future grins only serving to warn the unlucky target of Jotaro's rage that they are about to experience an unimaginable amount of pain.
Star Platinum is named after the seventeenth Tarot Card, The Star, which symbolizes optimism, discernment, and hope.
Star Platinum can bend steel with its bare hands
Star Platinum is a Close-Range, with a basic reach of only 2 meters from Jotaro's body, but with incredible strength, speed, and precision.
As one of the most powerful Stands featured in the series, Star Platinum has an overwhelming physical prowess in every basic characteristic, save for range. Coupled with Jotaro's own cleverness in combat, the Stand is capable of defeating most Stand users without the use of any complex abilities. In addition, Jotaro's eventual discovery of its true potential only makes it all the more formidable in combat.
Super Strength: Star Platinum possesses immense strength, being able to throw a Jeep carrying four men and a girl out of the path of an 18-wheeler with one hand, later pulling the same Jeep out of a canyon with only a car as a counter-weight, and destroy large artificial diamonds within seconds. This same strength allows it to launch itself and its user into the air to clear long distances.
Super Speed: Star Platinum boasts phenomenal speed. It was able to intercept a bullet fired from point-blank range, briefly contended with Silver Chariot (whilst it was using Anubis), and is stated to exceed the speed of light.
Precision: Star Platinum is incredibly precise; it can surgically remove an object embedded in a person's skull without ill effect, catch both a bullet and a minuscule Stand like Lovers between his thumb and forefinger in midair, and create a near photo-realistic drawing of a small Egyptian fly from a dark, blurry photo.
Enhanced Eyesight: Star Platinum utilizes eagle-like eyesight throughout Stardust Crusaders. Jotaro has used Star Platinum's eyes to see four kilometers across a desert, as well as identify meaningful details, such as a specific type of fly in high-resolution images. It can also follow a card shuffle performed by a professional gambler, subsequently recounting the entire new order of the deck.
Enhanced Breath: Star Platinum inhales with superhuman lung capacity, capable of sucking in the entire fog Stand Justice and holding it long enough for its user to suffocate.
Enhanced Durability: Star Platinum's defense allows it to defend its user from various attacks such as Hierophant Green's Emerald Splash or The World's strikes. It is also able to minimize environmental damage when Jotaro is sent flying through objects.
Star Platinum can forcibly extend its middle and index fingers, allowing it to perform sneak attacks and stab opponents from afar. The technique's frequency of usage decreased as the battles intensified. Star Platinum only uses Star Finger twice in the manga: once against Dark Blue Moon, and once against Forever. However, in the anime, it uses it a third time against Polnareff wielding Anubis.
Star Platinum: The World
During the final battle with DIO in Stardust Crusaders, Star Platinum awakens the ability to stop time. The technique is referred to by Jotaro as Star Platinum: The World (スタープラチナ ザ・ワールド,Sutā Purachina Za Wārudo), named after the late antagonist's Stand, The World.
Star Platinum: The World stops time
When activated, Star Platinum is able to halt the flow of time for a brief moment, causing everything around him to appear frozen in place. During this time-lapse, Jotaro is able to interact with any object or person within his range. Measures of time during Time Stop correspond to normal measures, as shown by Jotaro's unwilling reduction in the duration of Time Stop affected by Made in Heaven. He is unable to use the ability consecutively, requiring a few seconds in between each usage.
In Jotaro's prime, the ability could last up to 5 seconds, but decreased over time due to lack of combat. Ten years after its initial use, Jotaro is only able to stop time for half a second, but intuitively extends it to 1–2 seconds throughout the later half of Diamond is Unbreakable.
In Stone Ocean, particularly during The Visitor story arc, Jotaro is still seemingly only able to stop time for up to two seconds, though the validity of this is questionable, as it was only mentioned within Jolyne's illusion created by Whitesnake's "Melt your heart" ability. During the final battle at Cape Canaveral against Made in Heaven, he is able to stop time for up to 5 seconds.
Star Platinum Over Heaven
The information below derives from a source not written by Araki. As such, it may or may not be considered canon.
SPOILER WARNING: Part / Game spoiler details may follow.
In the story mode of the game Eyes of Heaven, Jotaro eventually comes face to face with Heaven Ascension DIO, the game's final boss. As their fight went on, Star Platinum and The World's same-type aspect came into play once more, enabling Star Platinum to learn The World Over Heaven's signature ability: Overwrite Reality.
This grants Star Platinum the same potentially limitless ability to rewrite time and reality itself, the only true limitation being that it requires the use of its hands to do so. Despite these changes, Star Platinum does not gain an appearance change, unlike The World Over Heaven.
As a result of its powers, all of the temporal anomalies disappeared after the death of Heaven Ascension DIO. The world reverted back to normal and Jotaro lost Star Platinum Over Heaven.