Hinata Fujiyoshi is the newborn daughter of Masaki and Hiromu Fujiyoshi, and the younger sister of Hikari Fujiyoshi. Her name carries the meanings of "sunflower," "facing the sun," or "a sunny place". She is a supporting character, introduced as the newest member of the family during the story's progression. In terms of appearance, Hinata is an infant girl with light golden-brown hair that parts to the side and hazel or brown eyes. She is typically dressed in baby clothes such as a beige top, light red shorts, and a pink bib featuring a green frog design.

Hinata's personality is described as very happy and full of love for her family, traits she appears to take after her older brother, Hikari. As a newborn, her role in the story is largely defined by her presence as the new "ray of sunshine" for the Fujiyoshi household, bringing further joy to her parents' lives and making Hikari an older brother. Her motivations are not explored in depth due to her age, but her character is shown to be deeply cherished and protected within her family unit. One notable event prior to her birth is that her brother Hikari could sense that their father Masaki was pregnant with her before Masaki himself realized. Her key relationship is with her family, including her parents and her older brother Hikari. Hinata does not have notable abilities as she is an infant, and her character development is minimal within the main narrative as she is primarily a new addition to the family. The series takes place in an Omegaverse society, and her parents, Hiromu (an Alpha) and Masaki (an Omega), face some societal discrimination, but Hinata herself is presented as an innocent and beloved child at the center of her family's daily life.