Rock Human

In their everyday state, members of the species look no different from ordinary people, save for skin that seems faintly damp just after they rouse from dormancy. What sets them apart is chemistry rather than looks, since their bodies are built around silicon instead of the carbon that shapes regular humans. Each one can consciously turn their outer layer to stone and back again, blending into rocky surroundings and gaining extra toughness in the hardened state.

Sleep overtakes an individual without warning and can hold them anywhere from one to three months, after which they stay awake for at least two before the cycle repeats. While petrified, breathing all but stops apart from faint gas exchange through surface cracks, and their warmth and scent fade so completely that moss, fungi, and even pearls take root on them. They can endure this frozen rest for as long as twenty-five years and survive extremes ranging from roughly 950 degrees Celsius down to minus 240.

Reproduction mirrors human birth, though a newborn measures only about 23 millimeters and is left in the wild to fend for itself, often surviving by clinging to hunting wasps and slipping into their hives. Rather than growing steadily, they shed and remake their entire body every six years during sleep, taking a new resting pose each time. A lifespan near 240 years is thought possible, and when one dies it crumbles into stone, leaving no body behind.

Rock Humans are omnivorous to an extreme, feeding on plants, nuts, fish, meat, and essentially any living thing, with a fondness for honey and a shared allergy to mangoes. They revere the raw power held in the earth and in nature, and because they can weather any climate on their own, they feel no real need for homes, land, or possessions.

Psychologically, what most divides them from humanity is a near-total absence of social instinct. They form no lasting bonds, not even between parent and child, and mothers abandon their young at birth without hesitation. Any cooperation among them is purely transactional, driven by personal gain rather than loyalty or friendship. Their long dormant spells also make ordinary schooling or steady employment impossible, so those living among people gravitate toward work with flexible hours.

Coexistence with human society proves nearly unworkable. As development encroaches on their habitats, some slip into the family registry under false pretenses to hold property, effectively living as hidden parasites. Romance with an ordinary person is rare and reportedly ends in disaster about 97.5 percent of the time, frequently in someone's death.

Two traits define them in a fight. The first is command over stone skin, a shift between human and rock form that some are born able to trigger yet must learn to govern, with more practiced individuals even holding a mobile hybrid state. The second is a striking prevalence of Stands, carried by roughly 95 percent of the population, a rate credited to their treating Stand-awakening spots like the Devil's Palm and Morioh's Wall Eyes as their true home.

As the driving antagonists of JoJolion, most known members belong to the Locacaca Organization headed by Satoru Akefu, which seeks to monopolize the fruit's equivalent-exchange power for the race's benefit. A smuggling wing under Tamaki Damo, staffed by the likes of Aisho Dainenjiyama, Yotsuyu Yagiyama, and the A. Phex Brothers, ships Locacaca plants overseas by hibernating aboard cargo vessels, while a cell of doctors at a local hospital researches the New Locacaca. Other named individuals include Dolomite, Urban Guerrilla, Poor Tom, Wu Tomoki, and Tooru, alongside the Rock Animals Iwasuke and Doremifasolati Do.