Shibiretta, a central antagonist within the Eternal organization, embodies calculated malice. Her striking appearance merges the grotesque with the mystical: an aged figure crowned by a towering mushroom serving as hair, draped in a verdant cloak, and adorned with black boots and a spiraled medallion. Her staff crackles with volatile dark energy in battle, while her concealed face—marked by deep wrinkles, blemishes, and a hooked nose—lurks beneath the fungal headpiece.

Driven by vindictive glee, she revels in others’ anguish and harbors a visceral hatred for beauty, deploying psychological manipulation as her weapon of choice. Her signature artifact, a mystical storybook, ensnares foes within twisted fairy tale realms, where she warps objects into Hoshina—sleek, spherical monsters studded with eyes that spawn destructive minions. Her tactical arsenal includes limited metamorphosis into storybook personas and telekinetic control over her book’s pages.

Motivated by Eternal’s pursuit of the Cure Rose Garden’s power, Shibiretta abandons retirement after being coerced back by the enigmatic, manipulative Boss, whose cold indifference masks her unwavering loyalty. Her rivalry with fellow agent Anacondy simmers with contempt, their clashes fueled by competing strategies and a desperate bid for the Boss’s elusive favor.

Throughout her campaign against the protagonists, she hurls them into warped versions of *Pinocchio*, *The Little Mermaid*, and *Princess Kaguya*, each encounter escalating until her final defeat in episode 42 via the protagonists’ Rainbow Rose Explosion. Her name and design draw inspiration from *Hikageshibiretake*, a hallucinogenic Japanese mushroom, cementing her fungal motif.