Lucy Maud Montgomery endured a traumatic childhood in an abusive orphanage, marked by physical abuse that left a scar from a hot iron poker and ostracization as a "freak" due to her supernatural ability. This forged her initial distrustful and self-centered nature, making the Guild's instrumental acceptance valuable to her. Her ability, "Anne of Abyssal Red," unfolds a dimensional mindscape called "Anne's Room." This space features an exit door returning individuals to reality while erasing their memory of the room, and a locked prison door requiring a morphing key. The prison holds captives unconscious, guarded by Anne—a non-lethal monster possessing exceptional speed and strength that enforces capture-based games. Lucy can manifest multiple Anne copies simultaneously. During the Guild conflict, Lucy captured Kenji Miyazawa and later abducted multiple individuals, including Armed Detective Agency members and civilians, into Anne's Room. Her confrontation with Atsushi Nakajima culminated in his threat to trap her permanently in her own prison unless she released everyone. His unexpected kindness during this encounter destabilized her loyalty to the Guild and sparked a shift in her perspective. Deemed strategically useless by the Guild, Lucy pleaded to stay and was relegated to menial tasks. Later, during Atsushi's imprisonment on the Moby Dick, she initially taunted him but relented after recognizing parallels between his orphanage trauma and her own. She betrayed the Guild by giving Atsushi a critical item and using her ability to transport him to safety, resulting in her capture. Post-Guild, Lucy worked as a waitress at a restaurant near the Armed Detective Agency building, ostensibly to interact with Atsushi. She once discarded his report into water, leading him to jump after it. When he became entangled in submerged chains, she rescued him, indicating growing concern. During the "Cannibalism" arc, she aided the Agency by using her ability to protect Yukichi Fukuzawa, respecting his autonomy to leave the protective zone. Lucy exhibits a complex personality blending haughtiness, rudeness, and trauma-driven nihilism with emerging empathy. Her interactions with Atsushi, one of the few to show her genuine kindness, suggest developing feelings and gradual emotional vulnerability. She maintains traits like daydreaming, romanticism, a dislike of stingy people and isolation, alongside a pragmatic willingness to assist former adversaries under compelling circumstances.