OVA
Description
Maya Ooba, also known as Black Maya, is one of the main female characters in the anime series Guardian Hearts. She is a ninja from a traditional clan, though the reasons for her status as a runaway are not disclosed in the story. Despite leaving her clan, Maya continues to acknowledge her heritage and strictly upholds its customs. One such tradition requires that any outsider who discovers a ninja's true identity must be killed to preserve secrecy. When the protagonist Kazuya stumbles upon her ninja tools and learns her secret, Maya attempts to follow through on this rule. She is stopped by Hina, the Guardian Heart, who protects Kazuya. In the ensuing conflict, Kazuya helps Maya escape, thereby saving her life. Because another clan tradition demands that debts be repaid, Maya feels obligated to move in with him in order to return the favor.

Maya's personality is initially defined by resentment and a rigid adherence to duty. She hates Kazuya at first, especially since their accidental encounters have led to him seeing her naked twice and kissing her twice; according to her clan's laws, these circumstances force her to become his wife. Over time, however, her feelings evolve. As she observes Kazuya's reliability and kindness, her hostility fades and she begins to believe that he is fated to be her husband. She still struggles to express her emotions openly, maintaining a stoic exterior even as her affection grows. By the final episodes of Guardian Hearts, she has accepted Kazuya as her husband in her own heart, and in the OVA sequel Guardian Hearts-Power UP!, she confesses her love aloud and demonstrates a willingness to cherish him regardless of his feelings for others.

In the story, Maya serves as one of several girls who come to live with Kazuya after he discovers their secrets. Her role is that of a driven, skilled fighter whose combat abilities rival those of the Guardian Heart herself. She harbors a strong grudge against the Guardian Heart for defeating her in their initial battle. This rivalry motivates much of her early involvement in the plot, as she joins the other resident girls in plotting to expose or defeat the Guardian Heart. Unaware that Hina is the Guardian Heart, Maya and her allies often devise schemes that backfire or lead to humorous misunderstandings. Maya's key relationships include her bond with Kazuya, which shifts from antagonism to romantic commitment; her rivalry with the Guardian Heart, which eventually softens as she develops mutual respect with Hina; and her camaraderie with the other girls Kurusu and Chelsea, who share her desire for revenge against the Guardian Heart.

Notable abilities include her ninja training, which grants her proficiency in stealth, combat, and the use of ninja tools. She is a capable and determined fighter, able to hold her own in direct confrontation. Her development across the series involves learning to balance her clan's strict traditions with her personal feelings, ultimately choosing love and connection over rigid duty. Maya remains fiercely proud and protective of her ninja identity, but she grows into a more emotionally open and loyal partner as the story progresses.