Setsura is a Yuki-Onna Yokai who also a guardian of Nurarihyon. She's also a mother of Tsurara Oikawa.
Setsura was illustrated by Hiroshi Shiibashi. On the Anime, she made her debut at Nurarihyon no Mago, episode # 08. She is voiced by Yui Horie. She takes great resemblance of Tsurara Oikawa.
Seeing by her appearance, she has a long grayish blue hair, mixed with black colors on the bottom and two wavy lines. She wear white Kimono and a white scarf. On the first season, she has amber eyes with two rings inside. Although on the second season, her eye colors are changed into a pinkish red.
Setsura is mostly seen calm and also a flirt lady to Nurarihyon as she is shown seducing him a lot. She's also jealous of Yo and says that she would steal Nurarihyon's kiss no matter what generations.
During the battle between Nura Clan and Gyūki Clan, Setsura also join the force of Nurarihyon.
Setsura appear again on the Past Arc and also accompany Nurarihyon attacking a group of Yokai who's attacking a human with an infant. She was appear to be in love with Nurarihyon as she's trying to kiss Nurarihyon. Much later when Nurarihyon brought Yo in front of his minions, Setsura was seen jealous seeing Yo get close to Nurarihyon.
When Nurarihyon ask Yo to become a Man and Wife, Setsura's jealously turned higher and ask him what so good about her. As Nurarihyon call her by her first name, she turned all red and call him a pervert.
When Yo was kidnapped by Lady Yodo, Setsura also appear and join along the battle to help. She was seen drink along the clan after the battle and says she would steal Nurarihyon's lips no matter what generations.
Setsura is a Yuki-Onna Yokai. Her element is Ice, making her to be able to blow a strong and cold snowy wind to her enemies to freeze them.
Setsura is one of the Playable Characters in a fighting game of Nurarihyon no Mago for PS3.