Rom is the older twin sister of Ram and younger sibling to Blanc, the goddess of Lowee. Together, Rom and Ram represent the Nintendo DS gaming hardware. Despite Rom's official status as the elder twin, Ram often acts more assertively. Rom herself maintains a reserved and shy personality, typically showing a neutral or frowning expression, a contrast to Ram's outgoing nature. The twins are inseparable companions, rarely venturing out alone, and Rom frequently exhibits concern or nervousness about Ram's actions. In her human form, Rom stands 132 cm tall with shoulder-length brown hair and blue eyes. Her attire features a pastel blue winter jacket with puffed sleeves, golden buttons, and white fur lining, worn over a gray and white overall dress. She accessorizes with a cap similar to Blanc's, boots matching her jacket's design, and a shoulder purse, incorporating hot pink as her signature accent color. Transforming into her goddess form, White Sister, alters her appearance: her hair turns blue with a shorter, messier cut featuring a long strand over her shoulders, and her eyes shift to bright pink. Her White Sister outfit consists of a white bodysuit with pink accents, long gloves featuring pink detailing, and connected boots with distinctive outer bands. Rom wields the Die Pencil as her primary weapon, fulfilling a support-oriented "white mage" role in combat. Her abilities focus on healing allies, enhancing their statistics, and providing defensive buffs, making her crucial for team survivability. She pairs strategically with Blanc for special combo attacks, and all four sisters (Blanc, Rom, Ram, and their other sister) can execute a combined special move. While effective in prolonged engagements, Rom requires early investment to build her SP reserves for optimal utility. Her narrative spans multiple titles. In *mk2*/*Re;Birth2*, Linda kidnaps Rom, prompting a rescue by Nepgear and allies that concludes with Ram's HDD-assisted intervention. Rom initially distrusts Nepgear due to her association with Purple Heart but warms to her after Nepgear recovers a lost pen. In *Victory*, Rom remains in her home dimension with other Candidates, becoming playable in Chapter 10. During *Hyperdimension Neptunia: The Animation*, Blanc initially forbids Rom and Ram from visiting other nations. Later, the twins visit a Lowee amusement park, where they are kidnapped, leading to Blanc's rescue and an emotional reconciliation. Rom also presents Blanc with a hand-drawn picture symbolizing their bond. She appears in spin-offs like *Producing Perfection* as a backup dancer, *MegaTagmension Blanc + Neptune VS Zombies*, *Cyberdimension Neptunia: 4 Goddesses Online*, and others, maintaining her core traits in varied scenarios. Trivia notes include her representation of the Nintendo DS's dual screens through her twin dynamic with Ram, their hats featuring rectangles evoking DS screen icons. Her name derives from "Read Only Memory," complementing Ram's "Random Access Memory" association. Additional details highlight her dislike of hot baths (*Re;Birth3*) and minor design variations, such as the absence of a white stripe on her dress in the anime compared to the games.