Ayako, whose full name is Mochizuki Ayako, is a significant figure in the group of allies surrounding the main protagonist. She is a young girl, roughly the same age as her liege, but her physical appearance is remarkably mature for her years. Ayako stands out for her towering height and strong, athletic build, which often leads others to mistake her for an adult woman. Her typical attire consists of a white kimono top paired with a red hakama skirt, and she often wears her long black hair down, tying it up when entering battle.

Ayako's personality is defined by a cheerful, bright, and open-hearted nature. She carries a friendly and unpretentious attitude, approaching both friends and challenges with a lively spirit. Underpinning this cheerful demeanor is a fierce loyalty, particularly towards Tokiyuki Hojo, whom she is sworn to protect. She takes immense pride in her role as one of his retainers and is determined to stand by his side. This sense of duty is fueled by her deep admiration for Tomoe Gozen, a legendary female warrior from Japanese history, whom Ayako strives to emulate as a symbol of female strength and heroism. Her feelings for Tokiyuki are openly expressed and go beyond simple loyalty, as she has stated her aspiration to one day bear his children.

The background of Ayako is that she is the daughter of Shigenobu Mochizuki, a prominent general. Some sources indicate she is the child of a concubine, yet she shares a warm and loving relationship with her father. Her upbringing took a turn when she began training to become strong, inspired by her idol, Tomoe Gozen. This training led her to develop a unique set of abilities that blend combat prowess with artistic talent. Her role in the story is solidified when the priest Suwa Yorishige selects her to be one of Tokiyuki Hojo's closest companions and a key member of the group known as the Elusive Warriors.

In terms of abilities, Ayako is considered immensely strong, a fact noted by Yorishige, who describes her as gifted in the arts of both peace and war. Her primary combat style relies on her extraordinary physical strength, allowing her to wield various weapons like the katana and naginata with devastating force. Although her technique may not be as refined as some of her comrades, her raw power makes her a formidable opponent. Her most distinctive ability, however, is her mastery of dengaku, a traditional form of music and dance performance. Her immense strength allows her to play up to five instruments simultaneously while dancing, a skill that is used to entertain and boost the morale of her allies. This combination of brute force and artistic grace leads Tokiyuki to remark that in a peaceful era, she would be an idol envied by all.

Her key relationships are central to her character. She shares a deep, loyal bond with Tokiyuki, whom she is determined to protect. She is also a close comrade of Kojiro, another of Tokiyuki's retainers, and the three of them form the core of the young lord's inner circle. As the story progresses, Ayako experiences development that sees her grow from a selected retainer into a distinguished warrior. After the conquest of Kamakura, she receives a massive, square iron pillar fitted with a blade named the "Beast of the Four Directions" from the blacksmith Goro Masamune, which becomes her signature weapon. Ultimately, after uniting with Tokiyuki, she is granted the honorary title of "Princess Warrior" by her father and becomes the sole landowner among her group of friends, signifying her growth and the high esteem in which she is held.