Nichika Ubuyashiki (産うぶ屋や敷しき にちか Ubuyashiki Nichika?) is one of the older daughters of Kagaya Ubuyashiki. Along with her sister Hinaki Ubuyashiki, she stayed by his side and died with him.
Like the rest of her family, Nichika had large eyes with pale skin. She wore her short, white hair in a blunt bob with a fringe.
Nichika wore a dark blue kimono with purple flowers and a maroon obi. On the left side of her hair, she donned a yellow ribbon.
Not much was known about her personality, but she does show a sense of loyalty for dying along with her twin sister when their father sacrificed himself to defeat Muzan.
Kiriya Ubuyashiki (産うぶ屋や敷しき 輝き利り哉や Ubuyashiki Kiriya?) is the only son and middle child of Kagaya Ubuyashiki and the head of the Ubuyashiki Household. After his father's passing he leads the Demon Slayer Corps as the 98th and final leader.
Kiriya has light, pale skin and large eyes. He has the same hairstyle as the rest of his siblings; a blunt bob with a fringe covering his eyebrows, colored black. As he was raised as a girl, he takes on a more feminine appearance during his first appearance.
During the Final Selection test, Kiriya wears a purple kimono with patterned flowers and a green obi. His head is adorned with a wisteria headpiece.
Later on in the manga, after he becomes the leader of the Demon Slayer Corps, he wears a black kimono with a long white kimono jacket that's reminiscent of his father.