Renge Miyauchi, a first-grade student at Asahigaoka Branch School during the events of "Non Non Biyori Repeat," stands 117 cm tall at six to seven years old. Her lavender hair appears in twin pigtails secured by yellow ribbons, a hairstyle originating from her childhood caregiver Kaede Kagayama. Characteristically half-open reddish-brown eyes, a trait shared only with her older sister Hikage among main characters, complete her appearance. Her personality blends precocious curiosity with distinctive eccentricities. She frequently ends sentences with "-non," reflecting the local Asahigaoka dialect, and greets others with the coined phrase "Nyanpasu," merging cat sounds and morning greetings. Typically maintaining a neutral expression and rarely smiling, she nonetheless conveys emotional depth through actions, especially within relationships. Advanced abilities for her age include exceptional artistic talent—evidenced by winning a children's drawing contest—mathematical aptitude enabling mental multiplication via rapid addition, and musical creativity through composing original melodies on her recorder, a gift from her sister Kazuho on her first school day. Family dynamics shape her background significantly. She is the youngest sister of Kazuho, her teacher, and Hikage, a high school student in Tokyo. Her parents work extensively in agriculture, resulting in limited on-screen interaction, though they manage daily routines like waking her. Her grandmother gifted her school backpack. Renge views neighbor Kaede Kagayama ("Candy Store") as a maternal figure due to Kaede's childhood caregiving when her family was unavailable; this bond includes Kaede teaching her piano and inspiring her artistic interests through crayon gifts. Peer relationships feature close friendships with transfer student Hotaru Ichijō, classmate Natsumi Koshigaya—who nicknames her "Ren-chon"—and seasonal visitor Honoka Ishikawa, her self-identified best friend despite geographical separation. She later mentors younger children Shiori and Kasumi, promising to be a responsible senior to the latter. Renge owns several pets, including a domesticated tanuki named "Gu," summoned with specialized whistles and fed meals she prepares. She previously cared for a tadpole shrimp called "Hirataira-san." Her interests encompass rabbits, curry, plum kelp tea, and candies, while she dislikes peppers. Personal growth emerges through seasonal experiences, notably her summer friendship with Honoka, teaching her to cope with separation through correspondence and future visit anticipation. In later series developments, she advances academically to second grade in "Non Non Biyori Nonstop" and third grade in the spin-off "Non Non Biyori: Remember," adopting a ponytail hairstyle reminiscent of Kaede's youth. Her evolving maturity includes aspirations to become a teacher—distinct from Kazuho's approach—and increased responsibility toward younger children.