Musashi, referred to as Jessie in localized releases, operates as a key member of Team Rocket, an organization notorious for targeting rare and powerful Pokémon. In *Pokémon the Movie: The Power of Us*, Jessie joins her teammates in scheming during Fula City’s Wind Festival, infiltrating a research lab to steal experimental materials. Their actions unintentionally exacerbate a crisis involving toxic spores and a spreading forest fire. True to her franchise persona, Jessie showcases her signature short temper, vanity, and relentless pursuit of high-value targets like Ash’s Pikachu. She collaborates with James and Meowth in chaotic plans that often blend ambition with improvisation.

Her film-specific design retains Team Rocket’s iconic aesthetic while introducing subtle variations: a sleeveless top layered over a cropped black undershirt highlights her midriff, paired with a purple belt featuring a silver buckle. These visual tweaks align with the film’s alternate continuity. Jessie’s behavior during the festival underscores her habitual underestimation of adversaries and impulsive shifts in focus—such as momentarily abandoning Pikachu-chasing ambitions to launch a juice business.

Franchise lore highlights her preference for snake-like and Poison-type Pokémon, a history of rivalries within Team Rocket, and a penchant for elaborate disguises to achieve her goals. While *The Power of Us* does not expand on her backstory or relationships beyond her role as an antagonist, her actions remain consistent with these traits. Her theft of experimental materials and comedic missteps directly escalate the film’s central conflict, forcing protagonists to address both Team Rocket’s interference and the environmental threats endangering Fula City.