|Location||Pitch Black World|
|Affiliation||Pitch Black World|
Nio has short brown hair that was parted at the side with cat ears. Her eyes is yellow and her sclera is reddish orange. Her eyebrows are round and short, and she has two brown tails one being darker and one being lighter. She wears somewhat similar of a tight black suit with a bell at the collar with black dress shoes. Her reddish orange nails are long and sharp. In her official character art, she is seen holding a fish in her hands.
Nothing much of her personality rather than she seems to be rather cheerful and playful.
Not much is known about her.
Up to this day, she have only appeared in some of the Deep-Sea Prisioner´s ilustrations and in one of their calendars, alongside with other youkais.
- Her name means "two tails".