Shuya Shinazugawa

Shuya Shinazugawa was a younger brother of Sanemi and Genya Shinazugawa.

Appearance
Shuya was a young boy of small stature and fair skin tone. His dark hair was shaved down and he had large purple almond-shaped eyes. He bore a resemblance with his two oldest brothers Sanemi and Genya.

Shuya wore a tan colored kimono with a two-tone black and light brown obi.

History
Shuya was born to Shizu and Kyogo Shinazugawa and was raised with 6 other siblings. His abusive father would often beat his family, though he was constantly protected by his mother from his outbursts. Eventually, Kyogo would die to a vengeful stabbing and the family would be at peace.

One night, as Shuya, Sumi, Teiko, Hiroshi, and Koto slept, Sanemi and Genya were concerned that their mother had not come home yet. As Sanemi ventured out to find her and Genya stayed behind, Shuya awoke with the rest of his siblings. The children became concerned over Shizu's lateness, even as Genya attempted to get them to go back to sleep to ease their concerns. Eventually, a loud knock rang from the door, leading Shuya to call out to his siblings that their mother had come home. Despite Genya's warning, Shuya, Teiko, Sumi, and Hiroshi ran to greet her and open it. The door burst open and Shizu, who had transformed into a demon, entered the house in a blur, killing Shuya instantly.

Swordsmith Village Arc
During his fight against Hantengu, Genya discovered the small demon controlling the emotion manifestations but failed to cut through his neck. The demon's manifestation of anger appeared behind him and prepared to deliver an unavoidable blow. Realizing he will die, Genya reminisced on his past, including the deaths of his siblings and mother.

Sunrise Countdown Arc
After the battle against Muzan Kibutsuji, Sanemi, who had sustained several severe wounds, lost consciousness and found himself in the afterlife, where he saw Shuya and his other fallen siblings in heaven.

Trivia

 * Shuya's given name contains the kanji for "concerning, settle, take position, depart, study, per" (就) and "to be, also" (也).
 * Shuya's surname Shinazugawa contains the kanji for "immortality, eternal life" (不死) and "river, stream" (川).