As seen in the film, Ercole is a bit arrogant and self centered, feeling everyone loves him, and needs to win all the time. In this role, you will be reenacting his lines from the scene where Alberto reveals he's a sea monster to Giulia, and Ercole, Guido, and Ciccio throw their harpoons just missing Alberto.
Voice Reference: https://youtu.be/CmItVx_KX4s?t=21