Ange, whose full name is Ange le Carré, is a central figure in her story, a seventeen-year-old spy whose life is built upon a foundation of deception and a profound, long-held secret. Her true origin is that she was once Princess Charlotte, the granddaughter of the Queen of the Kingdom of Albion. As a child, she found her life within the palace walls unbearably stifling and formed a secret friendship with a poor orphan girl who was her exact lookalike. On a day the two decided to temporarily swap places so the young princess could experience the world outside, a sudden revolution tore the nation apart. They were separated by the chaos, and the identity swap became permanent. The girl who was once a princess was left stranded in the lower districts, where she was eventually discovered and recruited by the Commonwealth of Albion's spy agency, Control. She was trained as an operative and given the name Ange le Carré, while her childhood friend was forced to continue the role of Princess Charlotte.

Ange presents herself to the world with a persona that is as much a tool as her firearms or gadgets. On the surface, she is a quiet, unsociable, and almost unnervingly composed young woman who wears glasses and speaks with a flat, emotionless tone. Her most peculiar and consistent trait is her habit of deflecting personal questions or tense situations with outlandish claims, most frequently that she is an alien from the Black Lizard Planet. This behavior often bewilders her allies and enemies alike, making it difficult to discern her true thoughts. Despite this cold and mysterious exterior, she possesses a deep well of concealed care and compassion. She frequently looks after her teammates in subtle ways, ensuring their safety as long as it does not jeopardize a mission. Her genuine, more vulnerable, and emotionally expressive side is almost exclusively reserved for private moments with the princess, the one person who knows her true identity.

Ange’s primary motivation is intrinsically linked to her past and her relationship with the princess, the girl who now lives the life she was born into. She carries a heavy sense of guilt and responsibility, believing she is the one who set in motion the chain of events that forced her friend to live a life of danger and pretense as a royal. Her ultimate goal is to atone for this by fulfilling the princess's own dream: to ascend to the throne as Queen and tear down the massive wall that divides their nation, creating a world where they can be together openly. Her role in the story is as the ace operative of the spy team White Pigeon, tasked with infiltrating the prestigious Queen's Mayfair School in the kingdom's capital. While her official missions come from Control, her true, overriding mission is to protect the princess at all costs and support her political ambitions.

Her key relationships are complex and layered. The bond with the princess is the emotional core of her existence; it is a partnership forged in childhood and steeled by years of separation and mutual sacrifice. They communicate in code and share a history that no one else can touch. Within her spy team, she maintains a professional distance. She works closely with the team's leader, Dorothy, an older and more experienced spy, but keeps her true past hidden from her. She relies on Beatrice for voice mimicry and on Chise for close-quarters combat, and despite her aloof demeanor, she forms a deep, unspoken loyalty to them. Over time, her relationships with her teammates evolve from purely professional to genuine friendship, a development that marks a significant shift in her character.

Ange undergoes notable development as she is forced to confront the limits of her solitary, self-reliant nature. Initially, she attempts to handle the most dangerous threats to the princess alone, driven by her guilt and her identity as the ultimate spy. A significant turning point occurs when she learns to shed this isolation and trust her comrades. In a crucial moment, she admits her own shortcomings and openly asks for their help, revealing a more honest and vulnerable side of herself that she had long suppressed. This acceptance of friendship and teamwork represents a major step away from the lonely, self-punishing path she had walked for years.

Ange is an extraordinarily gifted spy, a true all-rounder with a vast array of talents. Her most unique asset is a handheld device called a C-ball, which is built from a gravity-altering mineral. This allows her to manipulate gravity around herself, enabling feats such as falling from great heights unharmed, running on walls and ceilings, and performing incredible three-dimensional maneuvers. She is an expert marksman, typically using a Webley-Fosbery automatic revolver. Her skills also include lock-picking, hand-to-hand combat, masterful disguise and acting, and a photographic memory that allows her to recall even the briefest glimpse of a face. She is proficient in fine arts like drawing and music, which aid in her undercover work. While highly capable in almost every area, she is not without limits; she defers long-range sharpshooting to Dorothy, close-quarters sword fighting to Chise, and voice impersonation to Beatrice.