Nagare Hisui

Nagare Hisui (比水 流, Hisui Nagare) is the Fifth and Green King, as well as being known as the Ever-Changing King as opposed to how Adolf K. Weismann is known as the Eternal King, and runs the Green Clan, &lt;jungle&gt;. He has the ability to channel himself through a green bird named Kotosaka, and use it as a medium for communication. As of now, he is the strongest King, in terms of influence and power, among the Kings.

Appearance
Nagare is a pale young man with heterochromia iridum, his right eye blue and his left eye green, dark green, messy short hair, with his bangs covering his left eye. His apparel for the most part goes unseen, as he is restrained by long, teal straight-jacket left unfastened only at the bottom, with a tattered, ripped hem revealing yellowed leg restraints and dark blue strapped sandals.

He sits in a white, blue, and black wheelchair, which is accesorised with much technology. Notably buttons of different colours on each side: a red triangle, inverted blue triangle, and green square, however their functions are currently unknown. Across his lap sits a digital pad.

When Nagare unleashes his power, his appearance changes drastically. His Aura destroys the straitjacket confining him, revealing his outfit. He wears flowing white clothes, including a white shirt with an upturned collar and edged hem. The sleeves of his shirt are loosely sewn together by blue fabric shaped like the letter X, and the ends are ruffled. This stitching also occurs on his mid-back. Over his white trousers, he wears some sort of white robe or skirt. He completes the outfit with a white, unevenly tied scarf long enough to hang past his knees. His hair also glows pure white. His left eye is shown as green, and both eyes are slitted.

Personality
Despite being a King, unlike the strong bonding relationship of Kings and clansmen shown by other longtime rival clans such as the Blue and Red, Nagare apparently shows little to no concern over the safety of his own clansmen. This is evident when he was willing to sacrifice Douhan Hirasaka, who is considered an esteemed clansman based on her abilities, by activating JUNGLE's bomb despite how she was still in the area where she would likely be caught by the blast radius; Douhan was apparently surged with both disbelief and anger as she was unaware of how her King would easily make such decisions. Thus, Nagare likely sees his clansmen as expendable and will not hesitate to sacrifice them, much less inform them to be prepared, to achieve his goals. Along with this, Nagare is a blunt man, getting angered by most imperfect actions his clansmen make. Nagare does not seem to care how much loyalty any of his clansmen have toward him, and likely takes advantage of their devotion to him.

On the contrary, towards his J-Ranked Clansmen, Nagare has a calm, rather honest personality, and takes their eccentricity in stride. He appears to have great respect for Tenkei Iwahune, and often supports Sukuna Gojo's enthusiasm for video games, even congratulating him on levelling up in a game when he was supposed to be listening to Nagare's game plan. Nagare entrusts several of his major missions to Yukari Mishakuji, who often also acts as a more discilpinary figure over Sukuna when the latter gets sidetracked from the focus of missions. Nagare overall has a very informal relationship with the three J-Ranks, however he treats them respectfully, and goes as far as to say that the Clan ought to have a Christmas celebration after obtaining the Dresden Slate.

He uses Kotosaka as a way to see what goes on outside to compensate his being in a wheelchair.

Overall, Hisui is apparently a very manipulative man where he notably even manipulated the Colorless King into creating the later chaos that bloomed because of the advice the Green King gave him.

Nagare has an obsession for Adolf K. Weismann, which was why he went to great lengths to capture Anna Kushina, in order to use her divination powers to locate him. He also resorts to attempting to attack Weismann's Clansmen in order to draw him out, however, Neko is the exception, and he wants her brought back unharmed, since he feels they are similar in terms of both being incredibly powerful beings whose current identities are deeply affected by said powers. His enthusiasm over the Silver King's eventual return is one mixed of anger and relief. Nagare's main reason for obtaining the Silver King is to have him and his Clan join him in releasing the Slate's entire power and propel the evolution of mankind. However when the Silver King refuses, Nagare easily resorts to declaring war against him.

History
The damage of the Kagutsu Crater destroyed Nagare's heart, however his power as a King preserves his life.

He previously challenged the Gold King, claiming to want to "challenge the final boss". His power was enough to rival the Gold King's, but ultimately the battle ended in his defeat. Afterwards, Nagare's activities as a present King diminished greatly, and he left much of the fulfillment of his ambitions to Clansmen and missions issued via 's social media website.

He suffers from a "disability" keeping him restrained to his wheelchair, and is familiar with Neko's own history. He refers to her as Miyabi Ameno, and claims they are "similar".

Abilities
Green Aura: As the Green King, Nagare Hisui has a powerful offensive green aura that comes along with the ray / electricity. His power as a king rivals the King Gold, however, it can only full extent of his powers for a limited amount of time since it is essentially using his own life for it, since it is the only source to keep him alive. Regardless, he is more than likely the most powerful king, physically and in terms of influence. Using his power appears to energize and stimulate Nagare, as it is seen with a feral, cat-like smile before using it, and smiled wickedly late in his transformed state with a canine visible.

Mediumship: Nagare is able to communicate and see the outside world via using Kotosaka as a medium. Using this, Kotosaka's eyes often glow bright green, and his voice changes to Nagare's.

Transformation: When releasing his full power, Nagare exerts a huge amount of his Aura. Thus far, only his ability to transform in a lightning bolt has been shown, and he's capable of travelling at an incredibly fast rate, possibly breaking the sound barrier.

Trivia

 * Although while in his unleashed state, Nagare's left eye appears green, he's earlier seen with both eyes being blue. It's possible that the difference is merely a product of his Aura channeling into his left eye, however usually this would affect both eyes.
 * Previously, the official Return of Kings website accidentally let a prior design of Nagare leak. This design had him in his normal clothing, standing without the wheelchair.