Leona Miyamura is a supporting character in the anime and manga series Yamada-kun and the Seven Witches. She is the older sister of Toranosuke Miyamura and a former student of Suzaku High School. Known for her long silver-gray hair, striking pink eyes, and calm demeanor, Leona plays an important role in uncovering the mysteries surrounding the Seven Witches.

In the past, Leona was involved with the Supernatural Studies Club and investigated the school's witch legends alongside her friends. However, her encounter with the Seventh Witch, Rika Saionji, resulted in the loss of crucial memories related to the witches' identities and powers. The experience deeply affected her, causing her to withdraw from school and distance herself from the supernatural events occurring at Suzaku High.

Despite her reluctance to become involved again, Leona later assists Ryū Yamada and the Supernatural Studies Club by sharing what she knows about the witches and the rituals connected to them. Her knowledge of past events proves invaluable in helping the group understand the true nature of the witches' powers and the consequences of memory manipulation.

Leona is intelligent, perceptive, and mature, often acting as a voice of reason when others become overwhelmed by the mysteries surrounding the witches. Although she initially appears detached, she genuinely cares about her brother and those affected by the supernatural phenomena at Suzaku High.