Shiroyasha

Background
Manager of Thousand Eyes and the Demon Lord of the White Night. She is also a bit of a pervert.

She is the floor master of the east side, self-proclaimed strongest host among the 4 digits and below on the east side. She is more powerful than the Water God Izayoi Sakamaki defeated, this is proven after she stated that she is the one who gave the Water Serpent her Divinity.

Personality
She has a huge perverted personality and has interest in girls like Black Rabbit and Asuka. She shares this interest with Izayoi. In Episode 7 - Someone Might All Kissy with Asuka in the Dark?, Izayoi and Shiroyasha both complement Azuka's body figure in a very perverted fashion, and later on high-five each other after joking that Black Rabbit should wear a sexier costume while spectating an upcoming Gift Game.

Relationships
Black Rabbit - Shiroyasha can be a pervert to Black Rabbit at times.

Izayoi Sakamaki - It is shown that she is one of the few people Izayoi seems to hold some respect for. He was willing to give up on a duel against her and decided to allow her to "test" him, later Izayoi also goes to her for advice on a certain situation. It's unclear whether Izayoi respects Shiroyasha because of her strength and power or her perverted nature they both share.

Trivia

 * Shiro and Yasha in Shiroyasha's name literally means "White" and "Female Demon" which resembles her accurately.