Koyuki

Koyuki was the daughter of Keizo. Due to her sickness, she spent most of her time bedridden while being treated by Hakuji.

Appearance
Koyuki was a frail young lady. She had black hair which was always tied into a bun fastened with a hairpin and decorated with a Kushi (hair comb) and three snowflake hairpins. Her big eyes had pupils similar to pale flowers.

Koyuki wore a circle-patterned, pink kimono that faded into a snowflake pattern tied with an obi.

Personality
Koyuki had a kind and gentle personality, showing much gratefulness to Hakuji during his time looking after her. She would get emotional and cry when having normal conversations with him, especially concerning his reassurance of returning to the annual fireworks show, as it reminded her of hope and that there were many opportunities to enjoy the things she never had the chance to enjoy.

History
Koyuki was born very sick and with a weak body. As a result, her mother drowned herself as she did not want to see her baby die. While she was ill, her father brought home Hakuji and introduced him as her new caretaker, allowing the two of them to become acquainted.

Later on in her life, the heir of the dojo next door was in love with her, but he had an extremely violent and arrogant personality. He could never sympathize with her illness and during one meeting, he forced her outside when she was in bad shape. She started having an asthma attack and he abandoned her out of fear. Hakuji later discovered her alone and in pain, and potentially saved her from dying.

Koyuki was able to heal and live with the help of Hakuji and her father, she recovered two years later and became engaged to Hakuji.

Following Koyuki's marriage, the heir of the dojo next door became enraged and gathered his disciples to fight Hakuji. However after failing to defeat him, they cunningly poisoned the water well at the dojo. Koyuki and her father were poisoned after drinking water from the well, and she passed away at the age of 16 years old on the same day as her father.

Dimensional Infinity Fortress Arc
During the intense battle between Akaza, Giyu and Tanjiro, Koyuki appears as a voice of reason to try to stop Hakuji. She pulls his arm and sheds tears while begging him to stop fighting. Though he doesn't recognize who she is, Koyuki persists in trying to stop him and causes him to question his reasoning for wanting to kill the two swordsmen. As a result, Akaza remembers his memories of her when he was a human.

After regaining his compassion, Akaza attempts to destroy himself in order to finally reunite with his family. He tries to stop himself from regenerating but Muzan attempts to gain control of his mind. As Akaza begins to submit under Muzan's control once again, Koyuki's spirit gently grabs hold of Akaza's face and convinces him that he has done enough. Koyuki tightly embraces him and cries as he tearfully apologizes to her for failing to protect her.

She welcomes him with love and expresses her relief at his return home. Their spirits then disappear in an inferno of flames as Hakuji accompanies Koyuki to the afterlife.

Abilities and Powers
Koyuki was an ordinary human that did not posses any abilities or powers.

Trivia

 * Her name contains the kanji for "love" (恋) and "snow" (雪).
 * Akaza's characteristics as a Demon are closely related to her appearance:
 * Akaza's hair was the same color as her kimono, pink.
 * When Akaza activates his techniques, the snowflake shape of the formation resembles the hair decorations Koyuki wore.

Quotes

 * (To Hakuji) "Those silly talks with you Hakuji, made me happy. "
 * (To Akaza) "Thank you Hakuji, You've done enough."
 * (To Hakuji) "Welcome home my love."

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