Rose Oriana, princess of the Oriana Kingdom, was born to King Raphael and Queen Reina in a nation that revered traditional arts but scorned swordsmanship as uncivilized. Expected to master conventional arts, her path diverged when bandits kidnapped her during childhood, drawn by her noble bearing. Rescued by the mysterious Fancy Bandit Slayer, his swordsmanship profoundly impressed her, inspiring her to pursue the art against her kingdom's traditions.
As an exchange student at Midgar Royal Spellsword Academy, she rose to student council president. Her swordsmanship was second only to top graduate Iris Midgar. During a duel with first-year student Cid Kagenou, she dominated the match yet was deeply impressed by his unyielding resilience despite repeated injuries. Her respect evolved into romantic feelings after he appeared to sacrifice himself protecting her from a terrorist attack, though he survived.
A critical turning point came when she discovered her father brainwashed by Duke Perv Asshat, an operative of a cult manipulating the kingdom. To prevent her father from instigating war and end his suffering, Rose performed a mercy killing, an act that publicly vilified her. She soon exhibited symptoms of demonic possession, cured only by Shadow, leader of Shadow Garden. Following her recovery, she joined the organization under the codename No. 666.
Learning of her mother's betrayal and affair with Perv Asshat intensified Rose's resolve to protect her kingdom. Shadow inadvertently motivated her by leaving behind her father's ring, which she interpreted as a romantic gesture. She cut her hair to shoulder-length as a symbol of determination and ascended to the throne as queen after the deaths of Perv Asshat and Mordred. As queen, she faced international sanctions and church condemnation while rebuilding Oriana, secretly coordinating with Shadow Garden against the Cult of Diablos. She maintained her romantic feelings for Cid, who misinterpreted her actions as tyranny.
Rose possesses considerable combat abilities. Before joining Shadow Garden, she ranked among the academy's strongest fighters; her magical power increased significantly after the organization's training. She wields a rapier and skillfully manipulates Shadow Garden's slime bodysuit, morphing it into various forms like civilian attire or a wedding dress. Her physical capabilities allow her to subdue opponents even while injured, demonstrated when she overpowered Claire Kagenou despite a dislocated shoulder.
Her personality is trustworthy, kind, and lacking in understanding deceit, making her prone to manipulation. She is passionately devoted to swordsmanship and exhibits strong altruism, treating commoners and nobles equally. This passion sometimes fuels impulsive decisions, such as killing her father or initially refusing to discard mementos like a patty wrapper from Cid upon joining Shadow Garden. However, she demonstrates growth through resilience, commitment to her kingdom, and unwavering resolve against the Cult of Diablos.
Her surname "Oriana" means "gold" or "dawn" in Latin, reflecting her blonde hair and role restoring light to her kingdom. Her Shadow Garden number, 666, references the biblical "beast" from the Book of Revelation. After being healed by Shadow, her mana color changed from honey yellow to light green.