Police
- Primary work
- Diamond is Unbreakable
Other recorded work links
Police (ポリス, Porisu) is a tertiary character featured in the fourth part of the JoJo's Bizarre Adventure series, Diamond is Unbreakable. He is also a primary ally in the light novel Synchronicity in Morioh.
He is an elderly dog belonging to the Hirose Family that Koichi Hirose takes on walks.

Image attribution details
Police. Source illustration via JoJoWiki; copyright remains with the original rights holders.
Image via JoJoWiki. Original franchise/production rights holders retain copyright; the wiki text CC BY-SA license does not license this image.
Original image ↗ · Archived image ↗01Basic information
02Appearance
03Personality
Police is called a senile dog by Koichi. He has a sluggish demeanor, known for spending most of his day napping outside the Hirose residence. Since he is always sleeping, Koichi even checks if he is alive.↗↗↗
Police's personality is expanded on in the light novel Synchronicity in Morioh. Though seemingly unmotivated and appearing aloof or indifferent on the surface, Police displays subtle emotional awareness and a calm, observant nature. He rarely reacts to others, but he shows clear signs of attachment to those he trusts. For example, he greets Josuke Higashikata warmly and affectionately by rushing toward the door, wagging his tail, and licking Josuke's face. Since he gets migraines, he can tell when it is going to rain. He ignores unfamiliar people like Rohan Kishibe, even considering Rohan creepy because of the man muttering to himself.↗↗↗
Police's inner monologue reveals that he considers himself highly refined, preferring his sweet potatoes to be peeled and cut into bite-sized pieces for him. While he possesses a mild curiosity to see the world, his love for sleeping far outweighs his appetite or his adventurous spirit. This deep desire to explore without having to sacrifice a single second of his nap time ultimately manifests as his Stand, Sleep Trance. Since Police doesn't consider that his physical body could be in danger while his Stand wanders, Rohan deduces that Police has lived a very blessed and pampered life.↗↗
04Abilities
Stand
Police awakens his Stand, Sleep Trance, after accidentally swallowing a fragment of a Stand Arrow that was hidden inside a piece of discarded ham.↗
The Stand only activates while Police is in a deep sleep, allowing his consciousness to float freely and hijack the bodies of nearby people. Since Police is a lazy dog who wishes to explore the world without having to sacrifice his nap time, his Stand forces its victims into a dreamlike trance, moving them according to his subconscious desires.↗
05Story
SPOILERS
Diamond is Unbreakable
On May 8, 1999 at 4 PM, after Koichi encounters Tamami Kobayashi and returns home from school, he kicks a sleeping Police to check if he is alive. Police just opens one eye but doesn't react.↗↗↗
Later, Koichi tells Yukako Yamagishi that his mom wouldn't let him have another pet since the Hirose family already has Police. At night, Police is shown sleeping peacefully outside when Yukako kidnaps Koichi. When Koichi pees in his pants in front of Yukako, he feels that even his dog Police would lose respect for him.↗↗↗↗
Background
Police was born in distant foothills where cool winds blow and raised by breeders named Mr. and Mrs. Nakata. His breeders had eloped following a scandalous double affair, fleeing Tokyo in search of a secluded life together. However, their peaceful escape was short-lived, as rumors about them spread in their community. In response, the couple bought a large piece of land and started raising dogs.↗↗
During his time at the breeding facility, Police shared a room with a beagle named Blur. Unlike the lazy Police, Blur was an energetic, curiosity-driven dog who refused to return inside once taken out for a walk. Police observed that Blur's constant activity made him perpetually hungry, whereas Police found that his own desire for sleep far outweighed his appetite.↗
As a puppy, Police once dreamed of rolling around in sunlit harvested wheat stalks, which he recalls as having a fragrant aroma and a pleasant texture against his paw pads. He also recalls dreaming of eating golden, freshly steamed sweet potatoes that had been carefully peeled and cut into bite-sized pieces for him. Mrs. Nakata would often find him in these states, remarking to her husband that Police was "smiling" or "drooling" in his sleep.↗↗
Missing Link
On March 24, 2001 in the morning, Josuke Higashikata goes on a walk with Koichi and Police so he can learn the usual route, since he would be house-sitting for the Hirose family during their vacations. Police remains at the Hirose residence while Koichi and his family leave for their respective trips to Italy and Okinawa. Left behind, he spends the day in his usual routine of sleeping outside, not knowing how much time passed.↗
Once inside, he sits near the entryway until Rohan carries him into the living room. Rohan goes to call his editor on the phone, and Police begins to fall asleep. When Rohan returns to the room later, he stumbles and is about to collapse onto Police. Police panics and thinks that it is over for him, since he is half-asleep and could not dodge in time. However, Rohan activates Heaven's Door to avoid crushing him, which launches Rohan upward.↗↗
Spiritus Mundi
The next morning, Police wakes up completely lethargic, sporting a high fever and refusing to eat his dog food. Worried he might waste away, Rohan carries the heavy, limp dog to the animal hospital. The veterinarian arrogantly dismisses his condition as stress from being watched by a stranger, but Rohan realizes the dirty ham Police ate the night before caused a severe stomach strain.↗↗
Sleep Trance
The following morning, Police is in an excellent mood. He goes for a walk with Rohan, but walks so sluggishly that he constantly forces Rohan to stop and wait for him. Upon returning to the Hirose residence, Police lets out a sigh of exhaustion and falls into a deep sleep.↗
Unbeknownst to him, the ham he ate two nights prior contained a fragment of a Stand Arrow that was scattered around Morioh. This awakens his Stand, Sleep Trance. Due to his lack of control, the initial awakening causes poltergeist-like winds and beastly roars to echo through the house, terrifying a visiting TV crew who were following Rohan to interview him. In his dreams, Police realizes he can float around and possess people's bodies.↗↗
06Plot details
SPOILERS
Profile details
Status Status based on their final appearance in the part(s) they are featured in: Alive (Part 4)↗
07Appearances
Chapter 286: Koichi Hirose (Echoes), Part 3↗
Chapter 294: Yukako Yamagishi Falls in Love, Part 1 (Mentioned) Mentioned only↗
Chapter 296: Yukako Yamagishi Falls in Love, Part 3↗
Chapter 298: Yukako Yamagishi Falls in Love, Part 5 (Mentioned) Mentioned only↗
Chapter 301: Yukako Yamagishi Falls in Love, Part 8 (Cover only)↗
08Sources & attribution
- Police
Source bibliography (10)
- JOJO magazine 2025 SUMMER Open ↗
- Synchronicity in Morioh Chapter 1: Missing Link Open ↗
- Chapter 294: Yukako Yamagishi Falls in Love, Part 1 Open ↗
- Chapter 286: Koichi Hirose (Echoes), Part 3 Open ↗
- Hotate Shinkawa (March 2026) Open ↗
- Synchronicity in Morioh Chapter 3: Sleep Trance Open ↗
- Chapter 286: Koichi Hirose (Echoes), Part 3, p.12; the ticket is dated the day before Tamami meets Koichi. Open ↗
- Chapter 296: Yukako Yamagishi Falls in Love, Part 3 Open ↗
- Chapter 298: Yukako Yamagishi Falls in Love, Part 5 Open ↗
- Synchronicity in Morioh Chapter 2: Spiritus Mundi Open ↗
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