TV-Series
Description
Nicole Koigakubo, identified as Momoko Koigakubo in Japanese releases, is a sixth-grade student and the eldest among her friends. She stands 5 feet 2 inches tall, featuring lavender hair styled in a ponytail secured by a pastel pink bow, long curtain bangs, brown eyes, and fair skin. Her standard outfit is a sailor-style school uniform: a white long-sleeved shirt with a blue collar and yellow bow, paired with a grayish skirt edged in white, blue knee-high socks, and brown loafers.

In the original Japanese version, she embodies fearlessness, independence, intelligence, tranquility, and care. She consistently supports her friends, displaying protective, sisterly affection especially towards Satsuki Miyanoshita and Keiichirou Miyanoshita. She exhibits no romantic interest in boys and confronts supernatural entities without fear, often taking charge during ghostly encounters. This very fearlessness prevents her from seeing certain ghosts like Babasare, which appear only to frightened children. An affluent background is subtly indicated through her early cellphone ownership and her parents' attire in one episode.

Her significant connection involves Satsuki's deceased mother, Kayako Miyanoshita. Kayako intermittently possesses Nicole's body to assist the group, an occurrence first happening during a cursed school arts festival. During one possession within a spirit world tunnel, Kayako communicates directly and apologizes for the intrusions. Nicole retains no memory of these events afterward. She met Kayako prior to her death during an unspecified hospital stay.

A major story arc centers on her targeted possession by the ghost Mrs. Shizuko, triggered after a photograph taken at a haunted railway reveals a spectral hand on her shoulder. Physical hand marks manifest on her neck and shoulder, causing severe illness. The ghost compels her to walk towards an oncoming train, though her friends rescue her. In the series finale, she graduates elementary school and departs for middle school following the defeat of the ghosts.

Trivia notes include her name meaning "peach child" ("Momo" for peach, "-ko" for child). She voices dissatisfaction with her weight in one episode, wishing to a ghost for weight loss. Her parents are Mr. and Mrs. Koigakubo; her mother works as a lawyer and her father manages a restaurant. She also has a cousin named Bery.

Adaptations portray her substantially differently. The ADV English dub reimagines her as a fundamentalist evangelical Christian who frequently references God, Jesus, and biblical scripture. This version includes disparaging remarks about Jews, Muslims, and homosexuals. She attempts to proselytize Keiichirou and references a pre-conversion life involving drug addiction and promiscuity, claiming she met Satsuki's mother in a Christian rehabilitation program. Despite these additions, her core role aiding the group against ghosts remains. The Latin Spanish dub refers to her as Nicole, emphasizing fragility and kind-heartedness, though her fearlessness and pivotal supernatural role align with the original depiction.