Juliana stands as the heir to the Holy Kingdom's throne after her father's death in battle. Her cheerful nature endears her to citizens and knights alike, marking her as a promising future ruler. Yet beneath this optimism, she adopts a knight's disguise to personally pursue vengeance for her father, revealing her fierce resolve and hands-on approach. This quest fuels her journey across multiple narratives, spanning main story arcs, character quests, and side missions like "The Queen’s Ascension" and "The Longest Day," along with event quests in the Holy Kingdom, Sage’s Tower, and Lake of Sand.

As a knight-class combatant, she wields blade and shield with expertise in both offensive strikes and supportive tactics. Her skills bolster allied attack power and movement speed while dealing light damage to foes. Unique abilities define her prowess: "Battle Princess" heightens her attack on enemy terrain and lessens damage when leading other knights, while "Holy Successor" restores allies' health whenever another activates a special skill—granting extra attack power if that ally is a knight. Her chain ability steadily regenerates health and reduces incoming damage in combat.

Beyond battle, she commands respect through strategic crisis decisions and rallying allies. In the anime adaptation, she confronts the Black Army directly, cementing her role as an engaged leader. Her development features emotionally charged confrontations that spotlight her determination and combat skill, consistently focused on shielding allies and restoring continental peace.

Visually, she sports pink hair, red eyes, and knightly attire, typically depicted with sword and shield. Merchandise like Nendoroid figures captures her gallant, battle-ready stances, mirroring her in-game and animated portrayals.