Koyuki was the daughter of Keizo, Due to her sickness, she spent most of her time bedridden while being treated by Hakuji. Koyuki was a frail, fair-skinned young lady with large, rounded pink eyes with white pupils shaped as flowers. She had black hair which was always tied into a large bun fastened with a hairpin and decorated with a Kushi (hair comb) and three snowflake hairpins Koyuki wore a circle-patterned, pink kimono that faded into a snowflake pattern tied with an obi, she is 16.