Teiko Shinazugawa

Teiko Shinazugawa was a younger sister of Sanemi and Genya Shinazugawa.

Appearance
Teiko was a girl of average height and light skin complexion. Her black hair was tied in a bow in the back and she had large almond-shaped purple eyes. She was very similar in appearance to her brother Sanemi.

She wore a mint green kimoni lined with white waving stripes and tied with a lime green obi.

History
Teiko was born to Kyogo and Shizu Shinazugawa. She had 6 other siblings, the oldest two being Sanemi and Genya. Their abusive father frequently used his size to torment them, though her mother had never failed to protect them from him. He would eventually die from a vengeful stabbing.

One night, as Teiko, Sumi, Koto, Hiroshi, and Shuya slept, their mother had not returned home, concerning Sanemi and Genya. As the oldest, Sanemi ventured out to search for her while Genya stayed at home to watch his siblings, shortly after which they would wake up as well. As dawn approached, they began to expressed worry since she had never been so late before, though Genya tried to ease their concern. When a knock rang from the door, Teiko, Sumi, Hiroshi, and Shuya ran to greet their mother.

Despite Genya's warning against opening it, the door broke open and their mother, who had transformed into a demon, rushed into the home, killing Teiko instantly.

Swordsmith Village Arc
When he fails to cut the neck of Upper Rank Four Hantengu, Genya, in his shock, realizes that the demon's manifestation of anger had appeared behind him. As the demon prepares to stab him in the head, realizing he cannot avoid the attack, his life flashed before him and he remembered his childhood, including the death of his family.

Sunrise Countdown Arc
As he lay dying from his numerous severe wounds from the battle against Muzan Kibutsuji, Sanemi found himself in the afterlife, where he saw Teiko and their other fallen siblings in heaven.

Trivia

 * Teiko's given name contains the kanji for "fidelity, upright, chastity, constancy, righteousness" (貞) and "child" (子).
 * Teiko's surname Shinazugawa contains the kanji for "immortality, eternal life" (不死) and "river, stream" (川).