Haru Okumura, heiress to the Okumura Foods fortune, grew up amidst luxury yet stifling control as a third-year Shujin Academy student. Her sheltered existence, dictated by her father's demands, fostered naivety and hindered genuine connections. An arranged engagement to an abusive man further imprisoned her. Her escape began when encountering Morgana led her accidentally into her father's twisted Metaverse Palace. There, she awakened her rebellious spirit and Persona, Milady, joining the Phantom Thieves as Noir. She actively fought to change her father's heart, seeking freedom, though his subsequent death complicated her path. With the Thieves, Haru found her voice, learned assertiveness, and built true friendships, evolving from forced obedience to self-determination, symbolized by Milady's transformation into Astarte.

Beyond the original conflict, Haru displays sharper confidence and wit, readily challenging figures like the police. She finds peace in gardening, plant care, and cultivating coffee, reflecting her nurturing side. Her aesthetic blends ballet grace and gothic flair in certain appearances. During a Valentine's encounter in a flower garden, she reflects on winter blooms symbolizing resilience to Ren Amamiya (Joker), revealing she sought solace in places tied to their bond during his absence. While voicing concern over his impending departure, she commits to visiting him, demonstrating loyalty and prioritizing their connection. Her character design juxtaposes elegant grace with underlying power, often visualized through sophisticated attire and wielding a battle axe and grenade launcher. She is known to harbor romantic feelings for the protagonist.