Juliet Persia, daughter of Turkish Persia and Ragdoll Persia, belongs to the influential White Cats faction at Dahlia Academy Boarding School. Her family operates under the West's feudal system, where females cannot inherit noble property or titles, fueling her determination to prove her strength and challenge gender inequality.

She possesses straight, hip-length blonde hair with a black ribbon on the left side, square bangs, and azure blue eyes, closely resembling her mother. Juliet wears the standard White Cats uniform: a white blazer, shirt, stockings, and black buckled shoes. For her disguise as "Julio" to interact with the rival Black Dogs faction, she dons a brown wig, contact lenses, and their uniform.

Her personality blends seriousness with occasional comical moments. Juliet exhibits strong confidence and refuses to be underestimated, influenced by her upbringing. She demonstrates genuine kindness, like motivating Black Dog children despite the rivalry, though she avoids retaliation to uphold White Cats' honor. She harbors fears of heights, zombies, and haunted houses, and struggles with practical skills such as cooking and using chopsticks.

Juliet's relationship with Romio Inuzuka evolves from childhood rivals to secret lovers. After his public confession at the academy fountain, she accepts his feelings conditionally, demanding he "change the world" to bridge their factions. Their relationship necessitates secrecy, leading to disguised meetings and shared efforts to reform academy dynamics. Key moments include their Sports Festival duel—where Romio accidentally gropes her, resulting in his disqualification—and a winter break where they share a bed platonically. She later kisses his cheek voluntarily, symbolizing deepening trust.

With allies, Juliet maintains a close bond with her roommate and childhood friend, Chartreux Westia, unaware of Chartreux's romantic feelings. She initially despises Chizuru Maru for his antagonism but befriends him as "Julio." Her dynamic with Aby Ssinia involves conflict, particularly after Aby sabotages her during the Sports Festival using spiked shoes. She gradually befriends Ameria Curl by adapting to Ameria's preferences.

Family relationships are complex. Her father Turkish initially neglects her due to gender-based succession laws, straining their bond. After discovering his hidden concern during a visit to the West, they reconcile. Her mother Ragdoll, a tsundere theater actress, openly loves Juliet but masks it; she indirectly supports Juliet's romance by warning her about past expulsions of cross-faction couples.

Juliet's character development shifts from personal strength goals to broader societal change. Initially, she seeks power to overcome gender barriers. As co-leader of the White Cats, she works with Romio to become a prefect, aiming to dismantle factional divisions. This culminates in their public relationship reveal during elections, followed by efforts to unify the academy. She later confronts her father in a duel to assert her right to marry Romio, symbolizing her commitment to self-determination.

She eventually marries Romio, adopting the surname "Inuzuka"—combining "dog" (inu) and "mound" (tsuka)—reflecting their union across factions.