Ayaka Tachibana is a supporting character in the anime "Recently, My Sister is Unusual." She is portrayed as a friend of the protagonist, Mitsuki Kanzaki, and is visually distinguished by her short brown hair and brown eyes, a style that gives her a somewhat boyish appearance. Her design often reflects a practical and no-nonsense demeanor.

In terms of personality, Ayaka is characterized by her kindness, care, and sense of responsibility, particularly in her role as an older sister figure. She is mature and tries to remain calm and make level-headed decisions, especially when dealing with the unusual circumstances surrounding Mitsuki. While her primary trait is her supportive and caring nature, she also exhibits a more grounded and sometimes critical attitude, particularly towards the absurdity of the situation her sister is in.

Ayaka's primary motivation throughout the story is to help her sister, Mitsuki, cope with a supernatural curse. This curse has bound a ghost-like entity, Yuu, to Mitsuki and forces her to experience intense and inappropriate sexual urges that can only be quelled through specific acts. Upon learning of this affliction, Ayaka takes it upon herself to find a way to break the curse and alleviate her sister's suffering. She often puts her own life on hold to support Mitsuki, trying to act as a pillar of strength and a voice of reason in a deeply troubling situation.

Her central role in the story is that of a confidante and caretaker for Mitsuki. While Mitsuki struggles with the curse and her strained relationship with her new step-brother, Yuuta, Ayaka provides a stable, outside perspective. She is often the person Mitsuki turns to for help, and Ayaka works diligently to research the curse and find solutions, even when the situation becomes emotionally and psychologically taxing for her as well.

The most significant relationship for Ayaka is with her sister, Mitsuki Kanzaki. Their bond is close and interdependent, with Ayaka acting as a maternal figure who is deeply invested in her sister's well-being. She is portrayed as a responsible older sibling who feels a strong duty to protect Mitsuki from harm, even if that harm comes from a supernatural source. The curse affecting Mitsuki also places a considerable emotional burden on Ayaka, forcing her to confront difficult and adult themes while trying to maintain her composure.

Notable abilities are not a significant aspect of Ayaka Tachibana's character. She does not possess supernatural powers or special combat skills. Her strengths are entirely mundane and emotional, consisting of her practical problem-solving skills, her emotional resilience, and her unwavering dedication to her family. Her ability to remain supportive and keep searching for solutions in the face of a bizarre and embarrassing curse is her most defining attribute.