Benisato is a secondary antagonist in the anime film Ninja Scroll, where she is a member of the Eight Devils of Kimon, a group of warriors with supernatural abilities. Her background is largely shrouded in mystery, with the film providing no details about her origins or how she acquired her powers. What is known is her role as a lethal operative for the Eight Devils, a group hired to facilitate a coup against the Tokugawa Shogunate.

Benisato is a beautiful and seductive woman whose most defining feature is her intricate, full-body tattoo of writhing snakes. This appearance is not merely decorative but a direct manifestation of her abilities. Her personality is predatory and hypnotic, often using her sensuality to disarm and mesmerize her targets before striking. She is confident in her powers but is ultimately treated as a disposable asset by her own comrades. Her primary motivation appears to be loyalty to the Devils mission, as well as a personal connection to one of its members, the immortal leader Himuro Genma, with whom she is romantically involved. This relationship creates a point of tension within the group, as Genmas primary male lover, the electrokinetic Yurimaru, is resentful of her.

In the storys narrative, Benisatos role is to serve as an early and significant threat to the protagonist, the rogue ninja Jubei Kibagami. She is the second of the Eight Devils to engage him in combat. Her mission is to eliminate Jubei, who has become an obstacle to the Devils plans. She confronts him in a secluded shrine, using her powers to ensnare him. Her key relationships within the story are antagonistic towards Jubei and his ally, the female ninja Kagero. Her connection to Genma places her within the Devils inner circle, while her failure in battle leads directly to her death at the hands of Yurimaru, who executes her from a distance for her incompetence and possibly due to his personal jealousy. This death highlights her lack of development; she is a formidable but static obstacle whose demise serves to demonstrate the ruthlessness of her own leader, Yurimaru, and the perilous nature of the Devils hierarchy.

Benisatos notable abilities are entirely centered on the control and manipulation of snakes. She can telepathically command large swarms of serpents, summoning them to attack or entangle her foes. Her snake tattoos are actually living entities that can detach from her skin to become real, venomous snakes. This power extends to her own physiology, granting her a form of limited regeneration or escape. When injured or cornered, she can shed her entire skin like a snake, leaving behind a hollow husk and allowing her to slip away from danger unharmed. Furthermore, she has a hypnotic quality, capable of stunning victims who gaze upon her alluring tattoos or her serpentine dance, making them vulnerable to her attack. Her body itself acts as a weapon, as she can conceal snakes within her body, including in her mouth, to deliver a surprise, poisonous bite at close range.