reincarnated as a beastman

the general term of the Beast Man is a half human half beast belonging to the forces of chaos. an entity from a different world to the world that story take place. the forces of can't have always and BT the world to destroy all civilization within that world and then keeps moving on to the next or what happens when a human is reincarnated into the body of a beast man with a system could you change the fate of the Beast Man or will it stay the same and they just become a Mindless murder like the rest of his Newfound kin