This research is mainly focused on the impact of bio waste filler in mechanical applications. The bio wastes from banana, pineapple and coconut plants were used for preparing Banana Fly Ash (BFA), Pineapple Fly Ash (PFA) and Coir Fly Ash (CFA) fillers. These fillers (1–4 wt. %) were incorporated with 30 wt. % of Sisal (S)/Pineapple (P) hybrid fiber composites using epoxy matrix. The X-Ray Diffraction (XRD) results proved the presence of quartz as the main element in the fly ash powders. Tensile strength of 23.78–33.79 MPa was observed by the substitution of BFA, PFA and CFA filler powders, compared to hybrid natural fiber composites with 20.45 MPa properties. Filler mixing add to the adhesion between fiber/matrix and increases the mechanical properties. Similarly, flexural and impact properties enhanced up to 22.11%, 21.77%, with filler incorporation. The SEM results explains good bonding nature by the application of filler powders. The EDX results proved the presence of silica and other inorganic content in the polymer composites adding to the properties.