|Height||2.84 metres (9'4")|
|Weight||196 kg (432 lb.)|
|Circle||Fifth Circle of Hell|
|Story Debut||Black Sun: Nightfall|
|Roleplay Debut||Chiaroscuro: Conclusion|
In short, Kōken'nin appears as a substantially decreased and slightly more Human-like version of a Kushanāda. Towering and extremely well-built by normal standards, he has tough, grey skin. His head is actually an exposed skull with elongated cranium and two fiery, vermillion eyes in the sockets. It is perpetually crowned by a flame of the same colour.
He wears a heavy set of black and white Akuhahen adorned with skull and skeletal motifs. Many rusty and oily chains are wrapped around his chest and arms.
His general attitude may be summed up as statuesque and ruthless. Typically, Kōken'nin acts with imperturbable and unyielding relentlessness, and while not overtly brutal or sadistic, is still extremely severe in demeanour nonetheless. In addition, he seems to possess a sense of somewhat dark humour, though rarely shown.
Powers and Abilities
Pyrokinesis: Fittingly for a Daemon, he may unleash potent fireballs and blasts of incinerating flames with little warning.
Hell's Chains: Kōken'nin is the Warden of the Fifth Circle and the overseer of the Kushanāda, and as such is equipped with the Hell's Chains wrapped around his body. He may extend and control those chains with his will and use them to great effect in combat.
Master Swordsman: As one of the oldest Yōkai in existence, Kōken'nin has incredible experience in sword fighting. Consequently, his skill far surpasses that of even an average Shinigami Captain. Despite the size of his cleaver-like sword, he wields it effortlessly and efficiently with only one hand.
Immense Strength: True to his imposing stature, he possesses a devastating degree of physical strength, being able to easily block a flurry of powerful strikes and send the likes of Hikari Maebure crashing through stone with a one-handed swing of his sword.
Immense Durability: Due to his natural toughness and the heavy set of plate armour he dons, Kōken'nin is virtually impervious to conventional attacks. In addition, he survived a direct hit with a full-power Hadō #63, Raikōhō, seemingly unscathed.
Enhanced Speed: Furthermore, he is surprisingly fast and nimble for someone of such giant stature.
Massive Spiritual Power: Allegedly one of the most powerful of Hell's Nine Wardens, Kōken'nin boasts a monstrous amount of spiritual energy, which far surpasses that of his elite subordinates. Even a strictly controlled release of his Reiatsu is sufficient to quake the entirety of his black fortress.
Similarly to his elite Yōkai enforcers, Kōken'nin may activate a so-called "Super Mode" that considerably increases his muscle mass and body size. In addition, curved horns grow from his head, two rows of spikes sprout from his back and blade-like protrusions emerge from his elbows.
- Chiaroscuro: Conclusion (Cameo)