Kōsaken Jakka

Kōsaken Jakka (交叉圏若火) is the materialized spirit of Raian Getsueikirite's Zanpakutō following the Shinigami's fusion with Genryūsai Shigekuni Yamamoto. When Raian transforms into Bankai, Kōsaken Jakka takes on the name Hinochidaichi no Jokai (火後大地の上界).

Appearance
Kōsaken Jakka takes on the form of a massive with reddish-orange fur, red slitted eyes, and ten long tails. His upper-body is structured much like a human's to the point of having opposable thumbs on its immense clawed paws. During one of his flashbacks, Kōsaken Jakka recalls its "birth". At this time, he took on the form of a, a young fox, though he was still much larger than Raian himself. In his adult form, Kōsaken Jakka is as large as some of the mountains in Raian's inner world.

When Raian enters his Bankai form, he becomes Hinochidaichi no Jokai, and his appearance is greatly altered. In this form, Hinochidaichi no Jokai's whiskers become much thicker, and circular markings appear on its shoulders, stomach, as well as the front and back of its paws. Lines also run down its spine, arms, legs and tails. Additionally, its fur becomes a vibrant golden-color which seems to glow.

Personality
Kōsaken Jakka is laid back spirit, spending most of his time in Raian's inner world asleep and dozing. When he is awake, the spirit is shown to be calm under most circumstances and very level headed. Being the union of Raian's Jūjiraiku and Yamamoto's, Kōsaken Jakka is a very wise individual, persistently acting as an adviser and mentor to his master. He is often the voice of reason whenever his master's temper gets out of control and helps strengthen his resolve when his friends aren't around or are unable to.

Despite these traits, Kōsaken Jakka seems to be a vengeful spirit. Upon sensing Akujin's presence, he recalls the pain that entered Raian's soul when the man caused Mashū Getsueikirite's death as well as the struggles that Raian faced during the initial crisis Akujin caused. He often encourages Raian to exact his vengeance against Akujin. He also seems to share his master's sense of rivalry, expressing his desire to fight Seireitou Kawahiru's Hanullim to see who is the stronger spirit. At the same time, during his master's reunion with Hikaru and Mizu Kurosaki, he showed his dominant side, with Raian recalling feeling Kōsaken Jakka's intense feelings of superiority to both Hikaru's Tenshitō and Mizu's Tenmatatsujin. Likewise, Kōsaken Jakka has shown to greatly care for Raian and the things that he cares about. Shortly after he was first "born", the "young" Kōsaken Jakka actually shed tears when Raian revisited memories of his now deceased brother, whom he had vowed to protect. At that time, Kōsaken Jakka silently promised his new master that he would give him the strength to keep his promise "next time". Nevertheless, the spirit has his own goals. He desires to become the strongest of all Zanpakutō, a status his predecessor, Ryūjin Jakka, once possessed. He claims that Raian does not have the desire to become the strongest, something that he has chastised his master for.

In Bankai, as Hinochidaichi no Jokai, he becomes much more violent and aggressive; reflected in Raian as an increase of confidence and assurance in the power of his Bankai. Hinochidaichi no Jokai exudes a strong killing intent and almost seems desperate to prove his superiority to Raian's foes and, sometimes, even Raian himself. He is also prone to outbursts, as the Hollow reiryoku from Raian's past Fullbring is present in his Bankai.

Powers & Abilities
As a mixture of Jūjiraiku and Ryūjin Jakka's powers, Kōsaken Jakka's spiritual pressure is tremendous, having its own source apart from Raian's; though they feel exactly identical. As a fire-type Zanpakutō, he can freely manipulate fire in various forms, shown during his and Raian's. His affinity with fire is so strong that even his spiritual energy is infused with great amounts of heat, the likes of which, even Seireitou Kawahiru and Saori Sumeragi have been shown to sweat and get visibly irritated by its presence.

Zanjutsu
Kōsaken Jakka can manifest an enormous version of its Shikai form, the size of which is proportional to his own size, easily dwarfing any human or Shinigami in size. Despite its size, he can wield it effectively enough to combat his master in their inner world. His sword swings also possess an enormous amount of strength, being able to cause massive shockwaves when done correctly.

Bankai
When Raian enters Bankai, so does his spirit; becoming Hinochidaichi no Jokai. In this form, his powers increase tremendously and he is able to use his various Bankai powers without command. The heat produced by his Bankai evaporates any water in the surrounding area and is a threat to Soul Society itself. Even Seireitou Kawahiru noted to Hikaru Kurosaki that they would need to get further away from Raian if he used his Bankai, later proven when Seireitou commented on how the heat was getting to him.

His Bankai is one of the few that are unable to be stolen by the Impero Nascosto's Bankai Stealing Devices, as it still has a large amount of room to evolve and it possesses innate Hollow reiatsu, left over from Raian's past Fullbring.

Influence
Kōsaken Jakka's appearance was strongly based on Kurama from the Naruto franchise. His abilities, on the other hand, were inspired by the mythical abilities of the Japanese.