Height 153 cm Nadeko, the main character of Nadeko Snake, is Tsukihi’s friend back in elementary school. She always wears a waist pouch, always casts her eyes downward, has her bangs covering her eyes, has a shy personality, and can be easily amused. Koyomi played with her a lot whenever she visited his house after being invited by his sisters. She refers to Koyomi as Koyomi onii-chan and appears to have feelings for him.

Spoiler

She was cursed two times by a classmate who liked the boy she rejected, and the rejected boy. While the first one is banished, Koyomi is forced to battle the second to keep it from killing Nadeko.

She's quite protective of her hair (particularly her forelocks) thinking that it's her place to guard more than her panties. When she finally combed her forelocks aside in Nisemonogatari, Koyomi commented that she has a glare just like a serpent, probably foreshadowing the story of Nadeko Medusa. In Nademonogatari,

Spoiler

Nadeko gains a power to draw, create, and then materialize shikigami, making her useful in the eyes of Izuko Gaen and gets offered a job, thanks to Yotsugi Ononoki