Rui

Rui is the primary antagonist of the Natagumo Mountain Arc of Demon Slayer: Kimetsu no Yaiba. He is also a member of the Twelve Kizuki, having held the position of Lower Rank 5 (の).

Appearance
Rui has the appearance of a young boy. His skin is white, with red dots. His hair is light pink and bears resemblance to spider legs. The sclera of his eyes are red, while his irises are pale blue. Due to holding the position of Lower Rank 5, Rui has the kanji of Lower Rank and Five tattooed into his left eye, signifying his rank.

As a human, he possessed normal black hair styled with the same spider-leg like haircut, with bright blue eyes.

Personality
On general basis, Rui is a quasi-calm individual, rarely raising his voice, and talking with everyone, demon or slayer, with a reasonable tones and vocabulary, though his low and guttural tones constantly imply repressed anger and annoyance. Every time he spoke with Tanjiro during their duel he remained somewhat civil in speech, never once insulting him or calling him a name.

Rui was a disturbed individual who desired the close bonds that a family has and expected family members to perform their own roles. To him, "family members" who do not perform their roles as he expects them to (namely to protect Rui unconditionally or follow his instructions) are worthless and as good as dead.

Despite the fact he yearns for a "family", his vision of one is incredibly twisted and founded on nothing but fear of him, instilled through repeated abuse on his fellow kin, which he does with unrepentant sadism.

Well aware of his power, he is incredibly authoritarian and cruel and has no qualms about mistreating others or punishing his "family" by stringing them up and leaving them to be burned by the sun when they go against his wishes. Because of his strength, he tends to act almighty and confident, although this arrogance, while hardly unfounded, does not blind him to potential threats to his life. Further, he is aware on some level that, despite telling Tanjiro when he saw Rui punishing Spider Sister that he wasn't watching a play, that his whole family is a sham, yelling at Spider Sister that none of his family member were able to fulfill their roles, or fill the void in his heart.

Because of this, Rui is incredibly sensitive to the subject of family and was furious when Tanjiro Kamado pointed out the more than evident toxicity of the bonds forged between his "family." This angered him to the point that he demanded that Tanjiro retract himself and his words and threatened to kill him if he did not comply. This stance contrasts heavily with his desire to have Nezuko Kamado for himself as his sister, after witnessing her selfless act of shielding Tanjiro from his threads, becoming obsessed with the idea of developing a bond with her, albeit still through fear and torture. This contrarian behavior is further evidence to Rui's delusions, mental insanity, and emotional instability.

In death, Rui did feel remorse for his actions, remebering a previous

Human Life
Many years ago, Rui was born with a weak, frail and easily stressed human body that even the very act of walking and breathing was difficult for him to do, causing him to spend a majority of his life trapped within his home being cared for by his mother and father, who despite his frailty deeply loved and cherished him.

One night, Rui was approached by Muzan Kibutsuji who then offered to "save" him and transformed him into a Demon. Now possessing a strong body Rui was finally able to move about freely for the first time bringing joy and happiness to his parents. However, this did not last, as he was now a Demon, Rui now needed to obtain sustenance by eating humans which then caused him to kill a man inside his home. This bloody scene was then discovered by his parents who were immediately horrified by what their son had done. That night his father and mother agreed that Rui had to be stopped and attempted to kill him in his sleep to prevent him from doing anything worse in the future.

His father then attempted to sneak up on him with a knife and told him not to worry for he planned to also kill himself in turn for killing his son, while his mother was sobbing and crying outside his door. However Rui awoke and in anger for their attempt on his life, killed them both instead in self-defense, rationalizing that his true parents would never try and kill him and thus considered them to be faked in denial.

However, as his mother lay dying Rui overheard her regretfully apologizing to Rui for not being able to give him a healthy body as she died, which then caused him to remember his father last words, promising that both he and his wife would follow Rui to the afterlife by killing themselves, caused him to realize that his parents did indeed love him and simply tried to stop him from fully becoming a monster, throwing Rui further into emotional turmoil. However, Rui persisted on the lie that his bond with his family was fake due to receiving words of encouragement from Muzan, who supported his initial denial that they couldn't possibly be his family due to not accepting his state as a Demon, and gave him encouragement to simply look for a new family.

Demon Life
Now as a Demon, Rui continued to kill and eat human gain more strength until he finally obtained the position of Lower Kizuki Five and joining the Twelve Kizuki after being acknowledged by Muzan. Due to repressing his painful memories as human, Rui requested to Muzan if he could create a "family" for himself. The latter then allowed him and he began to gather suitable "family members" who would each take the role of his new parents and siblings.

It was shown that he stumbled upon a lone female Demon while she was fleeing from a group of Demon Slayers, he then simply asked her if she wanted to be saved by him and if she agrees she'd have to do everything which he says. Desperate for her life, the Demon agreed, Rui thus then easily dispatched the group of demon slayer easily and warmly welcomed the female into his "family". He then proceeded to give her a small drop of his blood to strengthen her power and painfully alters her physical appearance to resemble his own and officially acknowledged her as his new "Older Sister".

Later Rui was informed by the Daughter Spider Demon about how one of his other older sisters was planning to escape the mountain and leave the family, enraged by this he proceeded to intercept this attempted escape and violently beat the Oldest Sister Spider Demon before stringing her up and leaving her to burn by sunlight of morning.

Natagumo Mountain Arc
Rui first make an appearance in episode 15, while Tanjiro, Murata, and Inosuke are fighting Spider Mother. He make an appearance by walking along a thread tied to tree tops, and announces that he will no let the slayers disturb his families peaceful life. He then say Mother with make short work of the slayers. Inosuke then attacks him by jumping off one of the slayers but is still unable to get enough height. After which Rui just turns and walks off, with Inosuke wondering why he even showed up at all. Later, Rui is shown making a Cats Cradle, saying he won't let anyone get in his families way, and how they are going to live in happiness.

Later (next episode), Rui is seen approaching Spider Mother, which visibly terrifies her. He asks her if she can truly win. When her terror stops her from asking, he simply asks if the fight is taking to much time. He then says she better get to it, or he will tell father. Spider Mother promptly assures Rui she will protect him, begging him not to tell Spider Father. Rui stand for a minute expressionless and impassive, then turns and leaves, telling her to hurry it up.

Later, after a clash with Spider Father, Tanjiro hears a scream. Investigating Tanjiro hears more cries and pleas for mercy, and the sounds of someone being struck. It is revealed to be Spider Sister, on her knees clutching her face, injured, and with Rui standing over her. Rui doesn't move, but asks what Tanjiro is looking at, stating that it isn't a play. When asked if Rui and Spider Sister are on the same side, Rui tells Tanjiro not to phrase it in such an infantile manner. Rui goes on to say that they are family connected by a powerful bond, but regardless, it was between him and his sister, and that if Tanjiro interfered he would carve him up. AT this Tanjiro, called Rui and his family bonds a lie. Rui grew very angry at this, but was interrupted by another demon slayer. After shredding him Rui returns his attention to Tanjiro, demanding to know what was said to him.

When the scene returns, Rui has engaged Tanjiro, striking with his threads. He then states that he won't kill Tanjiro in a single strike, saying he will disect him, unless Tanjiro retracts what he said, in which case he will make it quick. Later in the battle, after Tanjiro had developed the ability to detect his threads, Rui noted that Tanjiro was smart than he gave credit for, and that he didn't shrink back in fear, but believed that it wouldn't matter in the end.

Demon Abilities
Due to being one of the Twelve Kizuki, Rui received a larger amount of blood from Muzan Kibutsuji than a regular Demon would which allows him to possess incredible amounts of power. This strength easily surpasses that of other Demons, since he was easily able to conquer and cohere numerous Demons of Natagumo Mountain and force them to work for him and become his family. Evidence of his strength is further shown when he was able to easily overwhelm talented fighters like Tanjiro and kill scores of Demon Slayers with little effort.


 * Enhanced Physical Prowess: As a member of the Lower Ranks, he possesses an above average amount of Muzan's blood present in him, augmenting his physical capabilities to a superhuman level.
 * Enhanced Durability: -Rui has remarked that his body is incredibly durable and hard to cut, with it easily far surpassing the hardness of lesser Demons, as Tanjiro noted that Rui skin was much thicker that of his "Father", Rui even admitted that the durability of his skin far surpassed the durability of his own threads.
 * Enhanced Strength: Rui has displayed superhuman strength, being able to easily physically overpower Tanjiro by simply kicking him, despite he himself also possessing enhanced physical strength.


 * Demonic Blood - Similar to Muzan, Rui can augment and strengthen a fellow demon's overall power and give them access to new spider-related abilities by giving him a drop of his own blood, having done so in order to strengthen each and every one of his "family" who were all originally weak demons.
 * Cell Manipulation - As revealed by the Daughter Spider Demon, Rui has the ability to manipulate and change the physical appearance of other Demons who consume his blood, having altered the physical traits of his "sister" to match his own. He also likely did the same to his other "family" members to resemble him.

Blood Demon Art:




 * Spider Physiology: Rui, like the rest of his "family", has various spider-like traits and abilities.
 * Thread Manipulation: Much like the rest of his "family", Rui main form of combat uses threads that he creates using his own cells for offense and defense.
 * Steel Threads': Being the most powerful member in his "family", the sharpness and durability of his threads is powerful enough to easily break a Nichirin Blade, slice a human being into bits and pieces of mince meat and being able to easily subdue and capture fellow Demons with little trouble.

Techniques
When Rui uses his full strength, he begins pumping more of his blood into his hands that then extend into his threads, increasing the threads sharpness and cutting ability of the threads to then perform his Techniques.


 * -|Description=
 * Cutting Thread Cage - Rui creates a web-shaped string around his opponent to cut him to pieces.


 * Murderous Eye Basket - Rui creates a cage from his web around the target, that continuously shrink until it cuts the target to pieces.


 * Cutting Thread Rotation - Rui creates a rotating wheel of threads, that upon reaching the opponent will cut them to pieces.
 * -|Demonstrations=

Trivia

 * The kanji in Rui’s name means “success”.
 * Rui was ranked in 16th place as of the first character popularity poll with 191 votes.
 * Rui is one of two members of the Twelve Kizuki who met the people he knew in life while disappearing; the other being Akaza.
 * Rui's Blood Demon Art may have been inspired by the Imperial Arms of Lubbock from Akame ga Kill!, Cross Tail, as both grant the user the capability to wield steel threads from their fingertips, and both users use this power in a similar manner to one another.

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