Esperanza Nielson is a character introduced in the second season of the anime, Orphen: The Revenge. Her full name is sometimes listed as Esperanza Reika. She is the older sister of another key character from this season, Licorice Nielson. Esperanza's background is intertwined with tragedy and resurrection; she and her sister both died at some point prior to the events of the series and were later brought back to life through the power of the character Erukarena.

In terms of personality, Esperanza initially presents herself as cold and distant, which creates a mysterious and somewhat intimidating aura around her. However, this exterior masks a much warmer interior, as she is described as being a very sweet and talented person at her core. This duality speaks to a complex emotional state, likely shaped by her past death and revival. Her primary motivation is her deep-seated concern for her younger sister, Licorice. Along with her father, Esperanza actively assists Erukarena in a search for immensely powerful sorcerers, driven by the goal of protecting Licorice from any potential danger.

Within the story of Orphen: The Revenge, Esperanza plays a significant role as a new and mysterious presence. She is part of a family that re-emerges in the lives of Orphen and his companions, creating new conflicts and tensions. Her actions directly challenge the protagonist, as she attempts to take Licorice away from Orphen, viewing her sister's safety as paramount and perhaps questioning Orphen's ability to provide it. She is not just an antagonist, however, as she also takes on the role of a teacher, giving sorcery lessons to the young mage Majic. Her relationships are central to her character. The most important is her bond with her sister, Licorice, which fuels all her actions. Her dynamic with her father positions their family as a unit working toward a common goal. Her relationship with Erukarena is one of alliance, as Erukarena's power is the source of her continued existence. With Orphen, her relationship is adversarial, marked by a struggle for influence over Licorice. Her interaction with Majic shows a more instructive, if still enigmatic, side.

Throughout the series, Esperanza's development is linked to the unfolding of her family's mysterious past. As memories of her family resurface for Licorice, Esperanza's own history and motivations become clearer. Her initial cold demeanor is gradually understood as a facade for a fiercely protective and caring nature. Esperanza also possesses notable abilities. As a resurrected being, her very existence is tied to powerful magic. She is a sorceress with sufficient skill and knowledge to formally instruct Majic in the magical arts. Furthermore, she has a very distinctive aesthetic and attribute: she is never without her piano, which she carries with her at all times, suggesting that music, perhaps magical music, is an integral part of her identity and abilities. Physically, she is an adult woman with red hair that reaches her chest and brown eyes.