Kijin

Kijin (鬼人族) are powerful beings from the Ogre tribe who have evolved such after many long years. Sometimes called divine, there have been Kijins that have brought many calamities upon the world.

Aside from evolution by being named by a strong being, once every few hundred years an elderly ogre can evolve into a Kijin by themselves. Their ability is unnaturally high, it's said that even 50 elite Lizardmen can't beat a single Kijin. Kijins, in turn, can evolve into Fair Oni and Wicked Oni.

Known Kijins
These individuals used to be Kijin but already evolved further.
 * Benimaru
 * Shion
 * Souei
 * Shuna
 * Hakurou
 * Kurobe
 * Gobuemon (by vol 17)