Haru Okumura is a third-year student at Shujin Academy and the heiress to the Okumura Foods conglomerate. She becomes a late-joining member of the Phantom Thieves of Hearts, operating in the Metaverse under the codename Noir, where she wields a Persona—a manifestation of her inner rebellion.

Raised in a sheltered, affluent environment, Haru was obedient to her father, Kunikazu Okumura, even agreeing to an arranged marriage with an abusive fiancé to secure a business merger. Initially sweet, shy, and somewhat distant, she grows friendlier as she forms bonds with others.

Her development begins when the Phantom Thieves target her father’s Palace. She awakens her initial Persona, Milady, upon rebelling against her father’s distorted desires and the arranged marriage. Although the Thieves change her father’s heart, he later dies under mysterious circumstances without her immediate knowledge.

Haru continues working with the group to confront the true source of corruption. Her Persona evolves into Astarte, symbolizing a shift toward organic growth and reflecting her journey toward independence. In other media, she becomes more assertive, critical of authority, and confident in the group’s activities.

She appears in various spin-off titles, participating in adventures that showcase her combat skills and deepen her relationships. One of her hobbies is gardening, and she maintains a hidden vegetable garden on the school rooftop.

She is among the few characters canonically depicted with romantic feelings for the group’s leader, Joker. Her Phantom Thief outfit incorporates a gothic aesthetic, and her movement in a rhythm game spin-off was based on a ballet-inspired style.