Tina Sprout is a 10-year-old Initiator with a distinctive appearance. She has short, platinum blonde hair that complements her youthful features. While she initially appeared in a set of pink pajamas, her typical attire consists of a long green and black dress, which she wears during her assassination attempts. Her outfit is practical for her missions, and she also carries an earpiece to stay connected and receive her orders. Despite her young age, Tina’s appearance reflects her role as a skilled and deadly Initiator.

Tina Sprout initially displays the traits of a child, such as calling Rentaro a superhero, but her character deepens as the series progresses. As a nocturnal Initiator, Tina relies on caffeine tablets to stay awake, showing her dedication to her work. She is an efficient and skilled sniper, holding a high IP ranking of 98. Despite her proficiency, Tina lacks hesitation when following orders, having no qualms about attacking a police officer or even Seitenshi.

However, it is revealed that Tina struggles with her emotions when it comes to killing. During her attempts to take lives, her body visibly shakes with reluctance, indicating an internal conflict. After her fight with Rentaro and her eventual rescue and care by Kisara, Tina begins to return to her childlike traits. She gradually adapts to a more normal lifestyle, transitioning to a daytime routine and forming bonds with both Enju and Kisara, even though she previously attempted to kill them.

Despite her violent profession, Tina’s true nature is that of a kind-hearted girl, as pointed out by Sumire. Her internal struggle and eventual growth show a side of her that longs for peace and connection, beyond her role as an assassin.

Tina is initially introduced as an antagonist, working as a highly skilled assassin tasked with eliminating Rentaro Satomi. Her abilities as a Model Owl Initiator make her a formidable opponent, capable of precision attacks and extensive reconnaissance.

After her defeat and redemption, Tina is welcomed into the Tendo Civil Security Corporation. She becomes a reliable ally, using her skills to protect humanity alongside Rentaro, Kisara, and Enju.

Tina’s abilities, enhanced by her Model Owl DNA, allow her to excel in long-range combat and reconnaissance. Her role in the team often involves providing crucial intelligence and support during missions.

• Rentaro Satomi
  Tina shares a close and trusting bond with Rentaro, who helped her find a new purpose after her initial defeat. She admires him deeply and is grateful for the second chance he gave her.

• Kisara Tendo
  Tina respects Kisara as the leader of the Tendo Civil Security Corporation and works under her guidance. Their relationship is professional but warm, reflecting Tina’s growing acceptance within the group.

• Enju Aihara
  Tina and Enju develop a sibling-like dynamic, with Tina occasionally serving as a more reserved foil to Enju’s energetic personality.

Tina Sprout’s character represents redemption, resilience, and the power of trust and belonging in Black Bullet. Her transition from a cold-hearted assassin to a loyal ally highlights her growth and the series’ themes of acceptance and second chances. Tina’s exceptional skills and gentle personality have made her a beloved character, leaving a lasting impact on fans and the story alike.