Nichika Ubuyashiki

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 describes his sister as more skilled than him. Nichika also showed concern over Muichiro's well-being when he began to train intensely despite having barely recovered from his injuries. However, Amane prevented her from interfering with Muichiro's training. During her final moments, she showed no fear towards Muzan Kibutsuji intruding upon their home; she simply played and sung with her sister, accepting their demise.

Nichika was a girl who had large, purple eyes with pale skin. She wore her short, white hair in a blunt bob with a fringe. Nichika wore a dark blue Hōmongi kimono with purple flowers as its pattern and a maroon obi with a cream yellow obiage and juban under everything. On the left side of her hair, she donned a chartreuse ribbon.

Nichika is a regular human, despite being one of Kagaya's eldest daughters. She possesses keen instincts but lacks any extraordinary abilities, unlike her other quintuplet siblings.