Rui

Rui was a member of the Twelve Demon Moons, having held the position of Lower Moon Five.

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 Moon Five, Rui has the Kanji of five,tattooed into his right eye signifying his rank.

Personality
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 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 hang up fellow demons to be burned by the sun. 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.

Interestingly Rui is incredibly sensitive to the subject of family, and was furious when Tanjiro pointed out the more than evident toxicity of the bonds forged in the clan, with Rui demanding Tanjiro to retract himself. This stance contrasts heavily with his desire to have Nezuko 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 evidences Rui's delusions, mental insanity and emotional instability.

Demon Abilities
Due to being a demon and being one of the Twelve Demon Moons of Muzan and receiving more blood from the latter that then further augmented his power,Rui possess incredible amounts of power easily surpassing that of other demons,seeing as how he managed to conquer and coheres numerous demons in Natagumo mountain and force them to work for him and become his family due to them recognizing that he far outclassed them,evidence of his strength is further shown when he was able to easily overwhelm talented fighters like Tanjiro and kill scores of demon slayer with little effort.
 * 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 "Fathers ", Rui even admitted that the durability of his skin far surpassed the durability of his own threads.

Blood Demon Technique: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.
 * Regeneration- Being one of the Twelve Demon Moons Rui possess powerful regenerative power,as seen when he easily healed and showed no visible pain at having his face slashed and clawed by Nezuko and later was able to reattach his head after decapitating himself.
 * Threads - Much like the rest of his "family",Rui main form of combat uses threads that he creates using his own cells for attack and defense,with the sharpness and durability of the threads being powerful to easily break a Nichirin Blade and being able to easily subdue and capture Demons.
 * Cruel String Prison - Rui creates a web-shaped string around his opponent to cut him to pieces.
 * Cage of Murdering Eyes - Rui creates a cage from his web around the target, that continuously shrink until cuts the target to pieces.
 * Wheel of Chopping Threads - Creating a rotating wheel of threads, that upon reaching the opponent will cut him to pieces.

Trivia

 * Rui was ranked in 16th place as of the first character popularity poll with 191 votes.

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Руи