Nadeko Sengoku is Tsukihi Araragi's childhood friend and an acquaintance of Tsukihi's brother Koyomi Araragi. She was a victim of a painful curse that caused an invisible snake to coil around her and manifest scars that resemble snake scales. During her attempts to cure herself of the curse, she met Koyomi once again after not seeing him for a long time. She is the narrator of Otorimonogatari, Nademonogatari, as well as arcs in Yoimonogatari and Shinomonogatari. She is the titular protagonist of four main arcs: Nadeko Snake, Nadeko Medusa, Nadeko Draw and Nadeko Around, and three minor arcs: Nadeko Pool, Nadeko Mirror, and Kimi to Nadekko!. Nadeko is a young girl with dark brown hair and chocolate brown eyes. She is 153 cm(5'0") and her weight is around 38 kg. During the times when she was still cursed by the jagirinawa, her outfit consisted of a waist pouch, an orange newsboy cap, a pink blouse, an orange jacket and a pair of baggy denims — all of which were designed to hide the scars that covered her body. She also always casts her eyes downward, with long fringes covering her eyes. It can be assumed that her newsboy cap represents the "snake" that cursed her, as its shape resembles a snake's head. She later changes her style to a more comfortable set of clothes after being relieved of the curse, and she shows a preference to wearing skirts. Later in the series, she cuts her hair short. Nadeko has a shy personality, and can be easily amused. She's quite protective of her hair (particularly her forelocks) thinking that it's her place to guard more than her panties. She later develops a dependence towards Koyomi (whom she calls "Koyomi-onii-chan") which slowly intensified as the events relating to the snake curse puts a pressure on her.