sekibanki
The "Bizarreness of the Rokurokubi." Stage 2 mid-boss and boss of Touhou 14, Double Dealing Character.
A prideful and somewhat cynical youkai who lives in disguise in Gensokyo's Human Village. She's a rokurokubi, with a number of references to dullahan as well. Her ability to make her head fly has led to many disembodied head "gags":/pools/7868 in fandom.
She has red eyes and short, red hair, and usually wears a black shirt with long sleeves, a red cloak that may cover her mouth, a blue bow as a hair bow, and a red miniskirt.