Age/Build: 17 years old; average-to-tall teenage boy build, 173 cm (about 5′8″), 64 kg. Hair: Short, light brown hair with a slightly messy, casual style. Eyes: Amber/brown eyes that give him a warm, approachable look. Typical Outfit: Usually seen in his school uniform (dark blazer, white shirt, tie, and slacks). In casual winter scenes he wears a coat or jacket over regular clothes.

Age/Build: Appears around middle-school age at first but is 17; very short and petite at 154 cm (5′1″), 41 kg. Hair: Short brown hair with straight bangs. Key Accessory: A bright red Alice band (headband) that makes her instantly recognizable. Eyes: Brown eyes that match her hair. Typical Outfit: Often in a large tan duffle coat over a sweater and shorts, plus mittens, brown argyle socks, and snow boots. She also carries a small backpack with little wings on the sides. In later scenes she’s sometimes without the coat or mittens.

Age/Build: 17; average height for a girl in the series at 164 cm (5′5″), slender figure. Hair: Long, straight hair with a blue‑purple tint, reaching down to her waist. Her bangs fully cover her forehead, with the front parted into two small triangular “tips” at the top; sides fall to about neck length. Eyes: Light blue eyes. Typical Outfit: Mostly in her school uniform. At home she’s often in pajamas (sometimes with cute animal patterns).

Age/Build: Senior (older than Yuuichi); statistically the tallest and most athletic-looking female lead, with a more muscular build from sword practice. Hair: Very long, knee‑length dark blue hair tied in a low ponytail with a long blue bow; the bow’s fringes come down to her eyebrows, and side strands hang to about waist length. Eyes: Deep green eyes. Typical Outfit: Usually in her school uniform and almost always carrying her practice sword; she rarely appears without it.

Age/Build: Appears around high‑school age; 159 cm (5′3″). Hair: Long, flowing orange hair tied into twin pigtails with red ribbons; each pigtail reaches her waist, with bangs down to her eyebrows. Eyes: Light blue eyes. Typical Outfit: Blue denim jacket over a yellow‑beige shirt, short black skirt, long black‑and‑white patterned socks, and black boots.

Age/Build: First‑year high school student (younger than Yuuichi); 157 cm (5′2″), with a noticeably frail, delicate appearance due to her illness. Hair: Neck‑length straight brown hair with simple bangs. Eyes: Blue eyes. Typical Outfit: Often in a white woolen jumper under a brown checkered shawl, black knee‑high school socks, and black school shoes. Sometimes shown in her school uniform with a teal first‑year bow.

Kaori Misaka is a light‑skinned teenage girl of average height with a calm, composed look that matches her “big sister” personality. • Height / build: 164 cm (about 5′5″), 48 kg; a slender but healthy frame. • Hair: Long, flowing dark brown hair, parted in the middle and hanging down both sides in soft waves; she typically leaves it unbraided. • Eyes: Light blue, giving her a gentle but serious expression. • Usual outfit: Most often seen in her high school uniform; she’s also shown in a winter jumper/cardigan in colder scenes. Overall, her design echoes Nayuki’s in silhouette (long hair, similar height) but with darker brown hair and a more mature, composed bearing that fits her role as Shiori’s protective older sister.