Konomi Fujimiya lives in Asahigaoka, her lifelong home and birthplace. She attended the local Asahigaoka Branch School before moving to a nearby high school, where she is a third-year student during the main timeline. Her age progresses through the series: 13 in 2004, 15 in 2005, and 21 by 2011.

She has dark brown hair, typically worn in a single loose braid over her left shoulder, though earlier appearances feature a bob cut. Her eyes are purple.

Her personality blends approachability with maturity, presenting a caring, fun, and bright demeanor while also capable of seriousness, especially as a role model for younger neighbors like Komari and Natsumi Koshigaya. She exhibits straightforwardness and intelligence, often mediating conflicts such as those between Natsumi and Komari. She forms strong intergenerational bonds, engaging meaningfully with children like Renge Miyauchi and maintaining friendships with adults like Yukiko Koshigaya.

As a neighbor to the Koshigaya family, she frequently visits their home, fostering close ties with the siblings. She participates in traditional rural activities with them and other villagers, such as making dried persimmons; these shared experiences include gifting the persimmons to Hotaru Ichijo. She also joins group outings and cultural events, sometimes encouraging others like Hikage Miyauchi to take part.

Her background remains firmly rooted in Asahigaoka's community. She consistently serves as a stabilizing presence, bridging age groups through shared daily life in the countryside.