Kokushibo! {Hashira version}

He has very long, black, and voluminous hair that falls below his waist in messy, wild strands, giving him an almost "bestial" appearance. His face is serious and tired, with sharp eyes and a consistently cold expression, like someone who has carried guilt or suffering for years.
The most striking detail is on the left side of the face: an irregular red mark surrounding the eye, resembling a demonic scar or a birthmark linked to special powers. The affected eye has an intense and menacing appearance, reinforcing the character's supernatural aura.
The clothing follows a traditional Japanese style:
A dark purple, wide haori with ample sleeves;
Black uniform underneath;
Long, dark Hakama;
Traditional sandals.
The sword also draws attention. The scabbard has reddish tones with dark patterns, while the hilt is colored with vibrant details, creating a contrast with the character's dark appearance.
Based on the image's notes, he is called Kokoshibo Tokito, is 21 years old, and holds the position of "Moon Pillar." It is also stated that he was the younger twin and that his original name was Michikatsu, changed after his brother's death—which adds an enormous tragic weight to the character.
Overall, it conveys:
dark elegance
absurd force

Kokushibo has a twin brother named Yorichii... unfortunately, out of envy, Yorichii joined the Oni, turning against his own twin brother.