When they first came out of The Nemeton they look like a fire-fly then form into a human-like form. Under their Shinobi shōzoku (a type of dark-coloured clothing), they are made of pure darkness smoke-like. Their eyes glow a bright gold-green colour. They wear a Hannya (a Japanese mask).
Powers and Abilities
- Umbrageous Teleportation The Oni have the ability to teleport from one place to another through the shadows.
- Enhanced Strength: The Oni, like most other supernatural creatures have enhanced physical strength. Their strength is much more enhanced than Werewolves and even Alpha Werewolves.
- Self-Scanning: The Oni can perform a scan on any species of being human or supernatural. This process is used to identify any individual that has a Dark or malevolent spirit attached to them. Oni perform the test by looking into a suspect's eyes in an almost ritualistic fashion. If the said individual is not possessed, they are marked by the Oni on his neck behind the left ear with the Japanese kanji "Onore" (己) which means "self". This is to the suspect is still themselves. The process leaves the suspect incapitated in a state of hypothermia.
- Phasing/Intangibility: The Oni can phase through solid matter. They can also phase swards out of themselves.
- Enhanced Swordsmanship: The Oni are skilled in wielding a sword.
- Poison: Their swards are laced with a deadly toxin that is capable of killing the one wounded, even if its just a little nick. Once the Oni are defeated, the poison is rendered useless.
- Sunlight: The Oni cannot appear during the daytime/when the sun is out. When hit bu the sun's rays, they just disappear into smoke.
- Mountain Ash: The Oni are able to be trapped with mountain ash but after a while, they serch for weak points and break through.
- Silver: Chris Argent shot an Oni in the face with a silver bullet. It shattered his mask. Later, Allison shot an Oni with a silver arrow, only this time, it stayed in the host, killing it.