TV-Series
Description
Princesa Esmeralda, known in the original Japanese version as Princess Emeraude and as Esmeralda in Spanish-language dubs, is the sovereign ruler of the magical world of Cephiro in the anime Magic Knight Rayearth. She is a central figure whose quiet presence shapes the entire first story arc, appearing at first as a gentle princess awaiting rescue, then as a tragic figure whose true circumstances redefine the meaning of the quest.

Emeraude holds the position of the Pillar of Cephiro, the highest and most sacred duty in her world. As Pillar, her continuous prayers maintain peace, prosperity, and order across Cephiro, and the condition of the land directly reflects the condition of her heart. She is depicted as a beautiful and elegant young woman with very long blond hair that reaches the ground and with blue eyes in the anime, while official color artwork of the manga gives her green eyes. In the anime it is revealed that she was originally a noblewoman of Cephiro who later became the Pillar and that she has a younger brother named Ferio. Because her duty required complete devotion, she used her power to erase the memories shared between herself and Ferio, allowing him to forget her and her to forget him, so that neither would suffer from their separation and she could focus entirely on her prayers. In the manga version, Ferio remembers that she is his sister and left the palace of his own will.

Emeraude is gentle, elegant, and deeply compassionate, beloved by her subjects and devoted to her role. However, she is also only human, and the immense burden of the Pillar leaves her isolated and sorrowful. The central conflict of her character arises when she falls in love with Zagato, the High Priest of Cephiro. Because the Pillar is forbidden from loving any individual, as all of her energy must be dedicated to the welfare of everyone, her love for Zagato causes her heart to waver, and Cephiro begins to fall into ruin as monsters overrun the land. Unable to abandon her love and unable to fulfill her sacred obligation, she reaches a devastating conclusion: she wishes to die. Since no inhabitant of Cephiro may kill the Pillar and the Pillar cannot take her own life, she summons three girls from another world to carry out what no one in her own world can do. Her summons of the Magic Knights is therefore not a request for rescue but a request for an ending.

Throughout the first arc, Emeraude appears to be the kidnapped princess the Magic Knights must save, imprisoned by the supposedly evil Zagato. In truth, Zagato loves her and isolated her to protect her from the legendary warriors he knew were destined to kill her. When the Magic Knights defeat Zagato, Emeraude loses the person she loved most. Overcome by shock, grief, and hatred, she transforms into an older and more sinister version of herself, breaks free from her prison, and attacks the warriors while piloting a colossal battle entity of her own. In the midst of the battle, the lingering consciousness of the true Emeraude reaches out to the Magic Knights, explains the whole truth, and begs them to kill her before her hatred destroys Cephiro. The knights, though heartbroken, grant her wish. With her last power, the purified Emeraude appears smiling in Zagato's arms, thanking them, and sends them back to Tokyo. Her death spares Cephiro from immediate collapse but leaves the world without a Pillar, a situation that sets the stage for the second arc.

Her relationship with Zagato is the emotional core of her character, a forbidden love that dooms her, moves him to defy the Pillar system itself, and ultimately brings about both of their deaths. Her brother Ferio is also significant; in the anime she severed their bond of memory out of love, protecting him from punishment and sparing him the sorrow of missing her, while he grows into a swordsman who unknowingly aids the Magic Knights. The three Magic Knights, especially Hikaru, are the ones she burdens with her impossible request, and her final gift to them is gratitude rather than resentment. She also entrusts the creature Mokona to the magician Clef, instructing that Mokona guide the summoned warriors and that Clef apologize to them for the suffering her wish will cause.

Emeraude's arc moves from serene and regal duty, to quiet anguish under the weight of forbidden love, to a deliberate and tragic choice, and finally to a grief-driven loss of self. In her dark transformation she is consumed by anger and vengeance, forgetting that she herself summoned the knights, yet enough of her true spirit remains to plead for mercy and release. Her final moments restore her gentle nature as she finds peace in being reunited with Zagato, her story serving as both a warning about the cruelty of the Pillar system and an act of self-sacrifice.

As Pillar, Emeraude possesses the power to sustain an entire world through prayer, and her emotional state directly alters the reality of Cephiro. She can reach across dimensions to summon the Magic Knights from Earth, and she has enough magical mastery to erase memories, to free herself from magical imprisonment through force of will, and to manifest a massive battle entity when she confronts the knights. She is also bound by the unique rule of her position: she cannot die by her own hand or by the hand of any inhabitant of Cephiro, which is why the fate of the world comes to rest on outsiders such as Hikaru, Umi, and Fuu. In her final act, she uses the last of her power to return the Magic Knights safely to their own world, leaving her legacy as both the guardian who upheld Cephiro and the sacrifice who ended its flawed system.