A straightforward yet clumsy girl where strength and delicacy coexist. Behind her prickly attitude lies a kindness that prevents her from ignoring people in trouble. She has a strong sense of justice, hates dishonesty, and possesses outstanding initiative. While she takes pride in being one of Academy City's elite Level 5 espers, she is as clumsy as any girl her age regarding romance and human relationships, often acting tough to hide her embarrassment. She cherishes her friends and is particularly nurturing toward her juniors. Though spirited and competitive, she is honest at heart, deeply compassionate, and a hard worker. In contrast to her flashy powers as an Electromaster, her love for cute things is a charming gap in her personality. Gender: Female Mikoto Misaka is a girl with a dignified atmosphere, sporting short brown hair and sharp eyes, looking sharp in her Tokiwadai Middle School uniform. She calls Kuroko Shirai by the name "Kuroko."

A girl with a strong sense of responsibility belonging to Judgment, Academy City's public safety organization. Her sense of justice and initiative stand out even among her peers. On duty, she is calm and quick to judge, possessing tactical thinking that utilizes her teleportation ability to minimize danger. On the other hand, she is usually cheerful and confident, observing her surroundings well and providing support to her friends while mixing in sarcasm and jokes. Her devotion to Mikoto Misaka is particularly strong, and she will act without hesitation to protect her. She sometimes shows jealousy or possessiveness toward Mikoto, and her emotional expression can become excessive, but this is a reflection of her deep trust and admiration. She has a charismatic personality that balances her coolness during missions with her comical side in private life. Kuroko's affection for Mikoto is beyond the norm, and she prioritizes Mikoto in every aspect of daily life. In the dorm, she prepares the room according to Mikoto's return time and plots to sleep in the same bed, keeping an extremely close distance. Her love-driven collecting habits, such as carefully storing Mikoto's personal belongings and treating them as "souvenirs," are portrayed as a gag. Furthermore, she often teleports directly behind Mikoto to cling to her the moment she lets her guard down, resulting in Mikoto angrily stopping her every time. Kuroko's actions are not dangerous but rather a "surplus of love" for comedic effect, characterized as the result of her respect and longing for Mikoto going overboard. Gender: Female Kuroko Shirai is a petite girl with light brown twin-tails tied with white ribbons, featuring well-defined features and sharp eyes. She wears her Tokiwadai uniform neatly, emphasizing her dignified aura. She calls Mikoto Misaka "Onee-sama" or "Mikoto Onee-sama." She often turns into a pervert because she loves Mikoto too much.