The Oni Kind (鬼種, Kishu?) are a Phantasmal Species and a type of demon symbolized by inferno and scorching heat.[1] They declined as human civilization advanced, and are now all but extinct.

In Colorful Moon Tsukihime, Oni are said to exist in the following varieties:

  • Those who were from the start referred to as Oni, and fundamentally distinct from humans.
  • Those humans who by way of aberration (変異, hen'i?) become as Oni.

Known OniEdit

The following is a list of known Oni that have appeared within the canon:


Akiha crimson

Akiha close to becoming Crimson Red Vermillion, evident by her red hair

In the past of Japan, many families wanted to crossbreed with these creatures. This resulted in the present clans of half-breeds, such as the Tohno and the Kishima. The relationship between the half-breeds and the oni is not unlike that between the Dead Apostles and the True Ancestors. Both the oni and the half-breeds have been in conflict with the Demon Hunter Organization for quite some time.

Those with thick oni blood are often overwhelmed by their blood with Inversion Impulses, and those that maximize the blood are called Crimson Red Vermillion (紅赤朱, Kurenai Seki Shu?). Also known as Ancestral Return (先祖還り, Senzo Kaeri?), they are enveloped by an illusion-like fog and their demon blood overwhelms and consumes their human blood. Those that become Crimson Red Vermillion are never able to return to humanity again. Having a thick demon blood, Akiha Tohno has a high chance of becoming one. Her hair is normally red because she is close to becoming one, but she usually suppresses her demon blood to keep it black. The only other known Crimson Red Vermillion is Kouma.[2][3]