Ka Demon Tribe

The Ka (Trouble) Demon Tribe consists of Demons that Ginka, Kinka, and Empress Joka are affiliated.

Description
They are born as conjoined twins. They are partially humanoid, partially serpent that are tied together at their serpent ends of their bodies. They do not separate. Instead, they are regarded as parasitic twins. They instinctively fight to the death with the winner consuming the other one.

If they fail to kill, they emotionally bond with each other, driving them to hatred and obsession. Their skills improve to the point that they can not kill each other. As they learn to interact with each other, they can form alliances to gain an advantage against an external enemy. They also learn how to fight with various weapons in their futile attempts to defeat each other. Their battles between them have the side effect of destroying bystanders. Other weapons includes bursts of fire and electricity. They also gain the ability of non corporeal form and even separate such as when they took over Towa and Setsuna. Setsuna's demon poison nullified both of these abilities.

Since a final blow is unlikely, it is necessary for the tie to be broken by their Empress. Physical Corporeal separation is also unlikely. As Empress Joka proceeded to unravel them, Ginka was broken apart. According to Kinka, both twins die if one is not able to consume the other one.

Empress Joka gained the ability of multiple tentacles that she uses to grab and kill a twin before consuming it. If she decides to consume both twins, she has to do so one after the other. She has humanoid arms, which were severed more than once.

Personality
If both Ka Twins survive their instinctive fight to the death, they gain emotions and awareness about each other. They express rage and obsession over failure to win. When a permanent separation attempt occurs, their emotional link is disrupted, devastating both of them. Each twin has no ill will for the other twin, and even appreciates consuming and being consumed by the other twin.

The Ka Demon Tribe does not usually intentionally battle outsiders. They do assist other people in their battles, such as Empress Joka assisting Zero. She had a vengeance against Sesshōmaru about the Pearls. Kinka requested Towa and Setsuna's assistance in freeing Ginka from Empress Joka. Joka declared the assistance to be interference.

Manga
Kinka and Ginka appeared in Chapter 416.

Anime
Kinka and Ginka appeared in Episode 5 of The Final Act.

They appeared again to demonstrate the trauma that Towa and Setsuna experienced during their own version of childhood separation.

Ginka, Kinka, and Joka appeared in Episode 10 of Yashahime. Joka appears in a flashback in Episode 15 to establish how she knows Sesshōmaru in which that Zero has sent her in attempt to kill his daughters but has been foiled and her arms have been cut down by his light whip as he stole Silver and Gold Rainbow Pearls as he told her "these here are Zero's tears". She returned to Zero that she can't sense the twins in which they put up a barrier in the Sacred Tree of Ages.