Ann is introduced as the representative of a noble family and serves as the head maid within the community, a position that establishes her as a figure of significant authority and responsibility from her first appearance. Her background is rooted in this leadership role among the other noble residents, where she is noted to possess overwhelming force that has never been defeated by her peers, setting her apart not just as an administrator but as a formidable physical presence. This combination of domestic oversight and raw power defines her unique standing in the settlement.

In terms of personality, Ann is characterized by a strong, no-nonsense demeanor and a practical approach to conflict resolution. When disputes arise between other nobles and threaten to drag on unnecessarily, she does not hesitate to intervene directly, physically separating the combatants and subduing them with force. If any protests are lodged against her methods, she simply uses the same forceful approach to end the objection, demonstrating a low tolerance for drawn-out arguments. This behavior is depicted as a regular occurrence, as scenes often show her asserting her opinion with a determined, bloodthirsty expression toward the protagonist Hiraku, highlighting a personality that is both assertive and unyielding.

Ann's motivations are closely tied to her duties as head maid and her role in maintaining order within the growing community. She works closely with Hiraku and is deeply involved in the management of the household and its expanding personnel. For instance, when her right-hand maid, Ramurias, becomes pregnant, Ann proactively decides to accept new maids to fill the gap, indicating her focus on the smooth operation of the village's domestic affairs, specifically targeting new angels as potential recruits. Her role in the story is largely centered on this domestic and disciplinary leadership, acting as an enforcer of order among the increasingly diverse and powerful residents.

Key relationships are central to her role. Her dynamic with Hiraku is particularly notable, characterized by her assertiveness and his occasional embarrassment. She is the one who enforces the private use of the term master, a Japanese honorific for husband, which Hiraku finds shameful and forbids her from using in front of others, though she does not entirely comply with his wishes. She is also a mother, having given birth to a second child after a child named Trin, and she works closely with her subordinate Ramurias, whose pregnancy prompts Ann's search for new staff. Regarding her development, Ann shows no signs of mellowing over time, as her forcefulness remains a constant, even leading her to extensively lecture the character Lu at a martial arts meeting for behavior deemed inappropriate for children's education, despite Lu's refusal to listen. Her notable abilities extend beyond physical combat to include a kind of authoritative presence that allows her to quell disputes with incredible speed. For example, while fights between other nobles, which take the form of horn-scratching snowball fights, can last up to three days, Ann can finish subduing both participants in a mere five seconds each. Additionally, she is noted to be exceptionally active at night, an aspect of her character that leads Hiraku to make an unexpected evaluation of her.