Ayano Kannagi is a sixteen-year-old student and a central figure in her family, recognized as the heir to the head of the Kannagi household. As a member of this powerful clan, she is an En-Jutsushi, a practitioner of fire magic, and takes great pride in her heritage and the family’s prestigious legacy.

Her personality is marked by a strong-willed and often impulsive nature. Ayano is known for being arrogant, brash, and prone to acting on her own, even when her actions go against direct orders. She tends to solve problems with brute force rather than careful planning, and her stubbornness can lead her to jump to conclusions without fully understanding a situation. While she appears undisciplined and rebellious, especially in contrast to traditional expectations, this behavior stems from a deep-seated pride in her family name and a conviction that her strength alone can overcome any challenge. However, this same pride can blind her; she often fails to see that the Kannagi family's own policies and actions might be the root cause of the problems they face.

Ayano’s primary motivation is her duty as the successor to her family. She is committed to protecting the Kannagi name and fulfilling her responsibilities, which include hunting demons and investigating supernatural occurrences. Her role in the story is largely defined by her partnership and complex dynamic with Kazuma Yagami, her cousin. Four years before the main events, Ayano defeated Kazuma in a ceremonial duel to become the heir, a loss that led to his exile from the family for his inability to wield fire. This shared history creates a tense and rivalry-filled relationship when he returns as a powerful wind contractor. Although she frequently claims to hate him and becomes irritated by his flirtatious behavior, Ayano develops a significant crush on him and eventually realizes she is in love with him. She is prone to jealous outbursts when Kazuma interacts with other women, yet she also respects his strength, acknowledging him as the only person more powerful than her own father. Her father, the family patriarch Genma Kannagi, often tries to encourage a relationship between them, believing her hot temper needs someone as calm as Kazuma. Ayano also has a younger brother, Ren, who idolizes Kazuma and serves as a bridge between the two protagonists.

Throughout the story, Ayano shows signs of development as she is forced to confront her own beliefs and the rigid expectations of her family. Her experiences working alongside Kazuma challenge her initial worldview and force her to mature beyond her reckless tendencies. In battle, Ayano is a formidable warrior who wields Enraiha, the Kannagi family’s sacred sword which she can summon at will. This sword possesses powerful fire properties. Her unique magical ability is known as the Crimson Flame, a potent and rare power that she cannot yet consciously control. Despite this lack of control, her skills as a fire user make her a dangerous opponent, particularly when she is able to channel her intense emotions into her attacks. Outside of combat, she has a notable sweet tooth and is often found at cake shops, using sweets to comfort herself, especially when she is in a bad mood.