This study aimed to develop and characterize polymeric films based on poly(vinyl alcoholPoly(vinyl alcohol)) (PVA), cassava starch, and oil extracted from tucumã larvae (Speciomerus ruficornis) using the casting technique. Formulations were prepared at different concentrations to evaluate structural, physicochemical, and mechanical propertiesMechanical properties. Optical microscopy showed that neat PVA exhibited a homogeneous and continuous surface, reflecting good polymerPolymer chain cohesion. The addition of starch led to dispersed domains, indicating phase interactions and contributing to structural reinforcement. Incorporation of oil resulted in hydrophobic microdroplets, revealing typical phase separation of emulsified systems. Moisture tests demonstrated that starch-containing films retained more water than neat PVA due to hydroxyl groups available for hydrogen bonding. Oil addition mitigated this effect, reducing moisture at intermediate concentrations. Regarding solubility, all films fully dissolved in water, confirming the hydrophilic nature of the matrices. Tensile tests revealed that starch significantly increased mechanical strength, while oil acted as a plasticizer at higher levels, decreasing rigidity. Overall, the PVA–starch formulation proved most effective for structural reinforcement, whereas oil can be used to modulate flexibility and functional properties. These findings highlight the potential application of these films as biodegradableBiodegradable and active packaging, aligning with sustainabilitySustainability goals and the reduction of conventional plastics.