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 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.