Abstract As polymers matrix composites are being utilized in many applications, it is very important to enhance the mechanical properties of such composites by deriving the multiple response based different input parameter combination. In the present study, an effort has been made to fabricate a banana fiber and banana-coir fiber reinforced hybrid green composite with different combinations to enhance the mechanical properties such as tensile properties, hardness, flexural properties and impact properties. The percentage of banana fiber, coir fiber, corn starch with glycerol has been considered as the input process parameters. The analysis of variance has been carried out to prove the homogeneity of the composite samples. Grey relational analysis has been proposed in decision-making process to rank the mechanical properties with respect to different input variables. It shows how the input variable affects the different mechanical properties and gives best suitable combination of input variable. It has been observed that banana fiber is making the most influential effect on the mechanical properties.