Shinobu Miyake is Ataru's childhood friend and classmate. At the start of the series, she appears to be Ataru's girlfriend, but Lum's entrance strains their connection. Shinobu claims that if Ataru wins the tag game, she will marry him, which drives Ataru to win, but his victory cry causes a misunderstanding in which Lum agrees to marry him. Shinobu is a tidy, charming, and modest young lady. Despite her feminine qualities, she frequently demonstrates superhuman strength, being able to easily hurl school desks or any other large/heavy object as needed; however, this strength is only seen when she is angry with Lum or Ataru.

"Shinobu Early" is based on her early series design, mostly with her ahoge, or cowlick. Later in the series, she has fuller hair, lacks the ahoge, and rounder head, hence the "Shinobu Later" model.

Shinbou Early

Main Tags: Shinobu, medium brown hair, blunt bangs, ahoge, black eyes, retro artstyle, 1980s (style)

School Uniform Blue: school uniform, red neckerchief, blue sailor collar, blue serafuku, blue skirt, blue shirt, pleated skirt, long sleeves, long skirt, brown shoes

School Uniform White: school uniform, red neckerchief, blue sailor collar, serafuku, blue skirt, white shirt, pleated skirt, short sleeves, long skirt, white socks, brown shoes

Casualwear: Casual-Wear, short sleeves, pink shirt, kneehighs, pink skirt, dress, socks

Shinbou Later

Main Tag: Shinobu, medium brown hair, blunt bangs, brown eyes, retro artstyle, 1980s (style)

School Uniform Blue: school uniform, red neckerchief, blue sailor collar, blue serafuku, blue skirt, blue shirt, pleated skirt, long sleeves, long skirt, brown shoes

School Uniform White: school uniform, red neckerchief, blue sailor collar, serafuku, blue skirt, white shirt, pleated skirt, short sleeves, long skirt, white socks, brown shoes

Winter Outfit (from Movie 3): Shinobu-Winter, beret, green headwear, fingerless elbow gloves, black gloves, red sweater, long sleeves, green undershirt turtleneck, green skirt, black pantyhose, knee boots

Date Dress: Shinobu-Date, yellow shirt, pinafore dress, blue dress, white collar, yellow hairband, long sleeves, yellow socks, red footwear, shoulder bag

Leotard: Shinobu-Leotard, headband, pink leotard, yellow long sleeves, orange shirt, tied shirt, athletic leotard, grey pantyhose, leggings, toeless legwear, stirrup legwear, leg warmers