Flute Demon

The Flute Demon was a Demon exclusive to the manga chapter Special One-Shot. He was responsible for the deaths of a small group of Demon Slayers and innocent civilians.

Appearance
The Flute Demon takes the appearance of a very elderly man with wrinkly skin, and incredibly long black downward-slanted eyebrows. He has long slanted eyes with black scleras similar to the Serpent Demon with the traditional fangs of a demon.

His attire consisted of a flower-patterned robe tied to one side by a white ribbon with long with long white sleeves with a thick black frame at the end. He has long black hakama 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.

Abilities and Powers
Due to him being able to easily evade Kyojuro's first attack as well as him killing nine Demon Slayers he was incredibly powerful compared to the average demon. In addition, due to him stating that he would soon join the Twelve Kizuki, it can be assumed that his strength is near equal to that of a Lower Rank.

Demon Abilities
Blood Demon Art: The Flute Demon's Blood Demon Art is a special flute that when played 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, etc.), thus making it nearly impossible to accurately move. He also commands two black demon wolves from his flute to kill/eat his opponents.

Quotes

 * (To Kyojuro Rengoku) "My dogs will devour you... as you wriggle like a filthy worm!"
 * (Last sentence before death) "No!! I was going to join the Twelve Kizu..."