Kairen (潰煉 Kairen?) was a powerful upper B Class demon, of the same "species" as Younger Toguro, who could regenerate and was immortal.
Backstory[]
Kairen using his abilities to kill Toguro's students.
During the affair of creating a joint dojo for human psychics a little over fifty years before the show took place, Genkai and Toguro frequently attracted the ire of many a demon who sought to ruin the team, their dojo, and their students. However, Toguro and Genkai were too strong for them. One of these demons did what the others failed to, and that was Kairen; he entered the dojo while the two were away and killed every trainee there. However, in the manga, Toguro was defeated by Kairen and watched all his students slaughtered and was unable to do anything. Later, it was revealed that Kairen was trying to coax the team into entering a Dark Tournament, and he was essentially pulling the strings of Toguro as Toguro did to Yusuke, years later.
Kairen met his demise.
In the finals of that Dark Tournament, Toguro killed Kairen by chopping him in half, but because of the pain he had felt for not being able to protect his students, he wished to become a demon like Kairen for his reward wish. The tournament committee granted this wish, and he became almost exactly like Kairen.
Trivia[]
Kairen, in the dojo.
- Kairen was labeled by Spirit World Intelligence as a Demon of the "Highest Class" which is odd, as the highest class of demon is S Class and Younger Toguro, who killed Kairen, was ranked as an Upper B Class, however at that time no A or S Class Demons were able to reach the human world and the knowledge of S Class was limited. Spirit World Intelligence most likely meant the highest class of demon capable of reaching the human world was B Class. Alternatively, "Highest Class" could actually be referring to Kairen's species, similar to the Quest class.
- In the original dub, it was stated that Kairen was the top contender for the Dark Tournament while in the FUNImation dub, he was stated to be the reigning champion.
- In the live-action, Kairen became larger and more realistic in appearance similarly as Younger Toguro's full transformation in the tournament when he murders all of Younger Toguro's students while Koenma explains to Yusuke about both the Human and Demon Worlds.