The ghost of a dead girl with a severed head. She has long black hair and pale skin. Her eyes are bloodshot and her mouth is torn. She has sharp teeth in her mouth, especially vampire-like fangs. Below the neck there is a stomach and spinal cord. Moves by levitating. Looks like she's unable to speak.  

A ghost that wants to kill you. 

Akira is a teenage girl with a voluptuous build. She has short hair whose coloration varies between black with a blue tint and dark brown. Her eyes have tiny pupils and no visible iris. While her eyes are usually colored black, they are also depicted as amber-colored. Akira has a noticeable upper bust and an angular face. Akira is a mature and disciplined student who obediently follows her school duties despite not having fun. But it is very easy to make her embarrassed. 

Nice girl with good looks 

From "Highschool DXD"
Grayfia is a stunning young woman in her early twenties, with back-length silver hair styled in braids adorned with blue bows and striking silver eyes. She typically wears a blue and white French maid outfit, complete with long sleeves and a white headband, complemented by red lipstick.
Grayfia is a strict and serious young woman with a calm, dignified demeanor and perfect etiquette. Despite her seriousness, she is kind and wise. She is over 500 years old.