Miori is a teenage girl of average height with fair skin, striking blue eyes, and brown hair. Her hair is styled in a unique ponytail that is split in half and curled at the ends, framed by two bangs that hang on the sides of her face, reminiscent of a Japanese princess cut. Adding a playful touch to her hairstyle, she wears a yellow hairband adorned with two flowers on the right side. She also has a beauty mark under her left eye, which adds to her distinct appearance. While not as endowed as some of the other characters, Miori has a well-developed, mature figure that complements her elegant demeanor.

Her attire consists of a pink and yellow kimono, decorated with intricate floral patterns at the bottom and on the sleeves, while the inside of the kimono is a contrasting red, visible at the collar and sleeves. To complete her outfit, Miori wears a black obi, cinching her waist. She also carries a black fan, which she often tucks into her chest when not in use, adding a final touch of grace to her ensemble.

Miori is a lively and spirited young girl who enjoys being in the presence of Rentaro Satomi, often seeking his attention and affection. Her playful and somewhat mischievous nature often annoys Kisara, especially when Miori’s attempts to get closer to Rentaro become apparent. Miori exhibits a girly personality, often using her charm and feminine wiles to try and seduce Rentaro. Her flirtatious behavior adds a layer of complexity to her interactions, as she seems to enjoy teasing and playing with Rentaro, all while stirring some tension among those around her. Despite her flirty tendencies, Miori retains a lighthearted, fun-loving side that makes her a memorable character.

Miori plays a key supportive role in Rentaro’s battles against the Gastrea. Through her father’s firearms company, she provides Rentaro with advanced weaponry and equipment, significantly enhancing his capabilities as a Promoter.

Miori frequently butts heads with Kisara, competing for Rentaro’s attention. Their rivalry provides moments of levity in the series, while also showcasing Miori’s fiery personality.

Beyond supplying weapons, Miori often offers tactical advice and intelligence, making her a valuable ally in the fight against Gastrea.

• Rentaro Satomi
  Miori has a close friendship with Rentaro, often displaying romantic feelings for him through her flirtatious behavior. Despite her playful demeanor, she is deeply supportive of Rentaro and his mission.

• Kisara Tendo
  Miori views Kisara as a rival, particularly when it comes to Rentaro. Their competitive relationship often leads to humorous and spirited exchanges.

• Shiba Family
  As the daughter of a wealthy firearms manufacturer, Miori has access to cutting-edge weaponry, which she uses to aid Rentaro in his Civil Security duties.

Miori Shiba’s character brings a blend of intelligence, humor, and resourcefulness to Black Bullet. Her support for Rentaro and her rivalry with Kisara add depth to the series’ interpersonal dynamics, while her contributions as a weapons supplier emphasize her critical role in the fight against the Gastrea. Miori’s charm and wit make her a memorable and enjoyable character in the series.