All Villains In Diamond Is Unbreakable

Anjuro Katagiri 

Anjuro, better known as Angelo is a hardened criminal made a Stand User by Keicho Nijimura whose presence prompts Jotaro Kujo to come to Morioh to arrest him. He then tries to attack the Higashikata Family and battles both Jotaro and Josuke Higashikata. His Stand is the water-based Aqua Necklace.

• Aqua Necklace: Anjuro is able to control a water-bound Stand which has the ability to take control or kill anyone whose body it enters, shapeshift, and maintain itself even as vapor. 
  
• Liquid Form: Aqua Necklace is able to disguise itself as any kind of liquid and take on their properties. It is usually water but the Stand has been shown to adopt the guise of brandy or even vapor.
• Possession: Aqua Necklace is capable of possessing people from the inside to control them by easily forcing himself into the body through its victim's mouth.

Keicho Nijimura 

Keicho is Okuyasu's older brother. He is the first in Morioh to possess the Bow and Arrow and liberally creates Stand users in hopes one of them can kill his monstrous father. Keicho himself is a Stand User and his Stand is the miniature army, Bad Company.

• Bad Company: Keicho's Stand is a miniature army, including infantry (some as paratroopers), tanks (with explosive shells) and helicopters (with missiles). 
  
• Military Firepower: Bad Company is a battalion of miniature soldiers and military vehicles and is equipped as such. Each of Bad Company's soldiers is armed with an M16 assault rifles, a parachute, and combat knives. The helicopters are armed with machine guns and missiles, and the tanks have scaled-down shells. Bad Company is also equipped with land mines.

Akira Otoishi 

Made a Stand user by Keicho Nijimura, Otoishi steals the Arrow from him and begins to battle the Joestar Group in order to drive them away or kill them then be able to commit his crimes in Morioh undisturbed. His Stand is the electricity based Red Hot Chili Pepper.

• Guitar Play: Otoishi is a competent guitar player, and is notably able to compose a solo on the spot and use right-hand tapping.
• Red Hot Chili Pepper: It is a small humanoid Stand which can travel through electrical current and absorb electricity to empower itself. Its dangerousness increases dramatically when it is near electricity. 
  
• Electricity Absorption: Red Hot Chili Pepper is capable of absorbing electricity to increase its raw strength and speed and heal its wounds. However, the downside of that ability is that these power-ups consume a lot of electricity and Red Hot Chili Pepper must remain near sources of electricity to keep its stamina.
• Electrical Transfer: Red Hot Chili Pepper can persist inside and pass through flows of electricity, and thus is able to hide inside power wires or batteries and quickly travel from one position to another through electrical cables.

Bug-Eaten 

Bug-Eaten is a rat nicknamed by Jotaro Kujo. It and its companion were made into Stand users by Akira Otoishi, acquiring both the same sniping Stand, Ratt. Jotaro Kujo and Josuke Higashikata hunt him down before it can procreate and make a swarm of rat Stand users.

• Ratt: Ratt is a robotic rifle-like Stand enabling Bug-Eaten to shoot corrosive darts over 60 meters away, which can melt and corrode anything they touch. It is also an especially deadly Stand not only because of its power, but also its range and the small size of its users. 
  
• Melting Darts: Ratt is a miniature cannon that can fire off barbed darts which will melt anything upon impact, be it flesh or even metal. Ratt can shoot its dart up to 60 meters away, fire in bursts, and can even bounce the dart off obstacles to hit from blind spots.

Yoshihiro Kira 

Yoshihiro is Yoshikage Kira's late father, turned into a Ghost. Despite Yoshikage's violent inclinations, Yoshihiro is fiercely protective of him. Yoshihiro attacks the Joestar Group with his own Stand, Atom Heart Father, and later creates several Stand users with the Arrow to try to assassinate the group and protect his child.

• Atom Heart Father: The abstruse power of Atom Heart Father makes it a fearsome and seemingly invincible Stand when it is set up. Yoshihiro Kira remained as a ghost in a camera when he died and is able to trap people into the space photographed by the camera. 
  
• Supernatural Photography: Atom Heart Father is bound to a Polaroid camera which takes pictures with several extraordinary properties. Yoshihiro only exists inside the pictures the camera takes and he alone can move inside them.

Tama 

Originally a street cat hit by the Arrow, Tama is taken in by Yoshikage Kira after becoming a plant-Stand hybrid named Stray Cat.

• Stray Cat: It allowed Tama to resurrect itself into a sentient plant that retains Tama's intellect and personality. It also allowed it to manipulate the surrounding air and form air bubbles to shoot at enemies.
• Reincarnation: The first witnessed ability of Stray Cat is to resurrect its former user, Tama the cat, into a plant after it dies. Stray Cat keeps its personality and memories but has now the body and needs of a flower.
• Plant/Cat Constitution: Stray Cat possesses cat-like and plant-like properties. In direct illumination it is quite powerful, but conversely is very weak at night.
• Aerokinesis: Stray Cat has the ability to control the surrounding air with its whiskers. Stray Cat's main usage of this ability is to make invisible bubbles of compressed air and shoot them toward its targets, but can also shield itself from attacks.

Terunosuke Miyamoto 

A Stand User given power by Yoshihiro Kira and prompted to attack the Joestar Group, he ambushes Koichi, Josuke, and Yuya. His Stand is Enigma. He is creative and skilled in eliciting fear.

• Enigma: Enigma is empowered when Terunosuke identifies a target's unconscious reaction when afraid. He can then capture them in a piece of paper. When the paper is folded, the target is trapped. He can use it on objects without any condition. 
  
• Paper Seal: Enigma is able to transform objects and people, including the user, into pieces of paper. Once transformed, the paper must be kept folded to keep the target transformed. If the paper is unfolded, the trapped object or person is released. Anyone can unfold the paper and release something.

Masazo Kinoto 

Masazo is an architect commissioned by Rohan Kishibe to evaluate the repair costs of his house but was also made an unwitting Stand user by Yoshihiro Kira. He acquires Cheap Trick but dies because of it. He possesses the Stand Cheap Trick who attaches itself to its user's back and kills him when someone else sees the back. It then reattaches to whoever saw the user's back. While hanging on the back, Cheap Trick remains invisible to everyone, even other Stand users, and has the power to make itself heard and understood by any person or animal.

• Cheap Trick: It is a unique Stand in that it can change user and actively seeks its current user's demise. Its sole purpose is actually to single out a victim and wear down its user's psyche until it can kill them and carry on to another hapless user. 
  
• Attachment: Cheap Trick's signature ability is to attach itself to its user's back. Cheap Trick then actively and relentlessly seeks to make someone else look at the current user's back. If someone does look at the current users back, Cheap Trick detaches from the host, killing them in the process, and attaches itself to the looker's back, beginning its process anew.
• Universal Speech: Cheap Trick's other ability is its power to make itself heard and understood by anyone, even animals. It describes talking as its main ability.

Yoshikage Kira 

Unnoticed in Morioh for years and undisturbed all his life, Yoshikage Kira is an abnormal and paraphilic serial killer whose routine is shaken when the ghost of his first victim, Reimi Sugimoto, begs the Joestar Group to look for him and he attracts unwanted attention by killing Shigekiyo Yangu. Kira is a Stand User and wields the powerful Killer Queen to create deadly bombs.

• Killer Queen: It is a humanoid, short-range Stand with the unique ability to cleanly, and completely, wipe out objects and people alike with targeted explosions. This ability takes three forms that Kira names Bomb #1, #2, and #3. 
  
• Bomb#1 (Bomb transmutation): By touch, Killer Queen may charge any object with explosive energy, which is then transferred into the first person to touch it. The Stand can then manually detonate the energy with a gesture, creating explosions of variable size and power.
• Bomb#2 (Sheer Heart Attack): An autonomous entity that detaches from the Stand's left hand. It tracks and destroys targets with infrared homing. It's virtually indestructible, and can not be destroyed by ordinary means.
• Bomb#3 (Bites the Dust): Developed with the touch of the Arrow, this ability is a booby trap that, when triggered, it allows Kira to loop time, resetting for up to one hour in order to outmaneuver attempts to investigate him.
• Air Bomb Transmutation (Stray Cat): With Killer Queen's Primary Bomb charging Stray Cat's condensed air bubbles, Kira may create invisible, speedy air bombs to use as projectiles.