Sonya is one of the protagonists of Kaduho's "Kill Me Baby," a professional teenage assassin belonging to a foreign hitman organization. She has short blonde hair, sharp sanpaku eyes, and a small but well-trained physique, making her a combat expert proficient in firearms, knives, martial arts, and explosives. While she looks cool and unapproachable, she is a character of great contrast who possesses the immaturity and cuteness appropriate for her age. Her personality is a mass of extreme vigilance and suspicion; she is conditioned to always assume those around her are enemies. If someone stands behind her or touches her suddenly, she reflexively attacks, making over-defensive reactions like throwing Yasuna, putting her in a chokehold, or pointing weapons at her a daily occurrence. She casually spits out dangerous lines like "Don't get close!" "Don't touch me!" or "Do you want to die?" but to her, this is just normal self-defense and she means no ill will. Her tone is blunt and short-tempered. She basically speaks casually and roughly, using many imperatives and violent phrasing. She stands out for her curt language, such as "Don't do that," "Right?" and "Are you an idiot?" and her retorts usually involve violence before words. However, she is surprisingly caring deep down, possessing a typical tsundere temperament where she ends up dealing with Yasuna while complaining the whole time. She often uses denial to hide her embarrassment, saying things like "I'm not worried" or "I'm only with you because I have to be," and the way she can't quite hide her true feelings in her behavior is part of her charm. Additionally, she has a cute side where she is terrified of ghosts, ghost stories, darkness, and other horror elements, becoming suddenly timid or flustered when scared. She also has a weakness for sweets and cute things, occasionally showing childish reactions. Her greatest appeal lies in this duality: a calm and collected assassin on missions, but a socially clumsy, ordinary girl in daily life. Blunt and dangerous, yet possessing a kindness that makes it impossible to leave her alone—that is Sonya, an indispensable character who provides both the laughter and the heart of "Kill Me Baby."