Kazuki Karaiya

Kazuki Karaiya (仮頼谷 一樹) is the main antagonist of Crazy Diamond's Demonic Heartbreak, a spinoff manga of JoJo's Bizarre Adventure. They are a police officer and a Stand user with a currently unknown Stand.

Appearance
Karaiya has an androgynous appearance. They have light-colored hair styled in a bob cut, a mole below their right eye, and flat eyebrows. They wear a typical Japanese police officer uniform in the springtime consisting of a hat with an emblem on the front alongside a coat with a white dress shirt and a dark tie underneath.

Personality
Karaiya normally appears calm and serious, but is secretly deranged and sadistic. Despite being a police officer, they are fine with Petsounds killing innocent civilians, including Josuke Higashikata, the grandson of Karaiya's coworker, Ryohei. Karaiya allows criminals like Koji Kiyohara to roam free if it means they can be of assistance to Karaiya's plans. Their calm demeanor can quickly change to reveal their true nature when they are angry. Their motivations are currently unknown.

Background
In March 1999, Karaiya somehow steals Petsounds from his cage in Cairo, Egypt, and brings the parrot with them to Morioh, Japan. They work in Morioh as a police officer in the Budogaoka Police Station.

Crazy Diamond's Demonic Heartbreak
Karaiya first controls Petsounds to use its Stand on the police inspector, Hiraoka. While driving to work, Hiraoka runs over several pedestrians and nearly crashes into Hol Horse.

At the Budogaoka Police Station, Karaiya takes interest when Boingo mentions that he lost a manga. Ryohei asks Karaiya to escort Boingo back to his hotel. Before they leave, Karaiya hopes that Ryohei could get a promotion someday for his hard work and passion.

Later, Karaiya has Petsounds use its ability to possess a group of chefs. Watching from an alley, Karaiya witnesses Hol Horse using his Stand to defend himself and is excited to learn that there are other Stand users in Morioh.

Without directly meeting him, Karaiya gives Koji Kiyohara permission to kill whoever he wants in Morioh's subway station, while also having Petsounds attack Josuke and Hol Horse. However, Kiyohara and Petsounds are both defeated by the duo, allowing Ryohei to arrest Kiyohara. While Kiyohara is in his jail cell, he sees a memory of Karaiya sitting beside him in a police car. Karaiya asks him how it felt to lose. When Kiyohara doesn't answer the question but instead asks who Karaiya is, Karaiya screams at him. Petsounds then appears behind Karaiya and activates its Stand ability on Kiyohara, causing him to shriek in his cell.