Aya Tokunaga is a character from the 1974 Japanese film Lady Snowblood: Love Song of Vengeance, portrayed by actress Kazuko Yoshiyuki. She is the wife of Ransui Tokunaga, a political radical and anarchist whose activities have made him a target of the Japanese government during the Meiji era. Aya and her husband are depicted as a happy and seemingly harmless couple, living a quiet domestic life in their home.

Within the story, the protagonist Yuki Kashima, known as Lady Snowblood, is tasked by the secret police to infiltrate the Tokunaga household by posing as a maid. Her mission is to spy on the family and ultimately assassinate Ransui. In this context, Aya Tokunaga serves as a key figure in the domestic environment that Yuki must navigate. She represents the personal and peaceful life that Yuki observes from within, which becomes central to the film's exploration of Yuki's internal conflict as she begins to question the government's orders. Aya’s relationship with her husband is portrayed as warm and loving, which stands in stark contrast to the violent world of assassination and political intrigue that Yuki inhabits. The development of the plot hinges on Yuki’s growing reluctance to carry out her mission, a reluctance influenced directly by her exposure to the Tokunagas’ genuine humanity and the threat of destroying their family. Further details regarding her background before the events of the film, her personal motivations, or any specific abilities are not elaborated upon in the available information.