Flute Demon

The Flute Demon was a demon exclusive to the Special One-Shot who desired to join the Twelve Kizuki. He was responsible for the deaths of a small group of Demon Slayers and innocent civilians.

Appearance
The Flute Demon takes the form of an elderly man with wrinkly skin, and incredibly long black downward-slanted eyebrows. He has long slanted eyes with thin slit pupils and pointed fangs, giving him a rather serpent-like appearance.

His attire consisted of a flower-patterned kataginu-sleeveless robe tied to one side by a white ribbon and long white kimono with a thick black frame at the cuffs. He has long black sashibuki/nu-bakama pants similar in appearance to the Demon Slayer Corps members with geta shoes. As well as this, he wears a black Japanese saggy cap with a tassel at the end.

Personality
Like most of his kind, the Flute Demon is murderous and disdainful of humans, happily displaying the corpses of Demon Slayers he had killed and taunting Kyojuro Rengoku by claiming he can join his fallen comrades in the afterlife. He also remarked about his devouring of five children and even joked about one child still alive and cowering before him. He also appears to be very confident in his own abilities and even believed he was destined to join the Twelve Kizuki.

Special One-Shot
The Flute Demon sits atop a rock, admiring the corpses of his victims. Kyojuro arrives at the scene and the demon smiles at his appearance, confident that he alone will not be able to defeat him. The Flute Demon taunts him with tales of his previous killings, reveling in the misery he has caused. Kyojuro rushes forward, determined to put an end to the demon's reign of terror. The Flute Demon dodges Kyojuro's opening attack and plays his flute, causing Kyojuro to slam his ears shut in response. The Flute Demon taunts him by describing his abilities in detail, claiming that he has now fallen victim to its sound, and summoning wolf-like entities to kill him.

As the wolves close in on him, Kyojuro, reminiscing on the efforts the fallen Demon Slayer must have endured before dying to the demon's attack, instantly rushes forward and kills both of the wolves with his Flame Breathing. The Flute Demon, too stunned after seeing his opponent's sudden power, sits in shock as the Demon Slayer uses Flame Breathing, Fifth Form: Flame Tiger, beheading him instantly. As his head rolls on the floor, the demon realizes that Kyojuro must have ruptured his own eardrums to avoid hearing his flute, before angrily ranting that he was supposed to join the Twelve Kizuki.

Overall Abilities
The Flute Demon is much stronger than an average demon, as evident by his development of a unique Blood Demon Art and successful killing of nine Demon Slayers. He was able to easily dodge Kyojuro's initial attack and his potent flute playing allows him to disrupt a victim's nervous system upon being heard, making anyone in his grasp helpless. However, he still proved no match for Kyojuro, who thwarted his Blood Demon Art by deafening himself before handily killing him.

Blood Demon Art
Flute Spells: The Flute Demon's main ability is to conjure a special flute that when played, enacts various effects.
 * Nervous System Disruption: When his flute is played, it disrupts the nervous system of his opponents: if they try move one of their feet, their head will move instead, if they attempt to move one of their hands, their feet will move, thus making it nearly impossible to accurately move once the flute is heard. Flute Demon's summoned wolves.png
 * Wolf Entities: The Flute Demon can also use his flute to summon two black wolves and command them to kill his opponents.

Quotes

 * (To Kyojuro Rengoku) "My dogs will devour you... as you wriggle like a filthy worm!"