Thorfinn Karlsefni is the main protagonist of the anime series 'Vinland Saga'. Born in Iceland, he is the son of the legendary Viking warrior Thors Snorresson. Following the assassination of his father, Thorfinn is driven by a desire for revenge against Askeladd, the man responsible for Thors' death. Throughout the series, Thorfinn matures from a vengeful child into a complex character grappling with themes of violence, honor, and redemption. His journey is marked by his evolving understanding of what it means to be a true warrior.