Thorfinn also nicknamed Karlsefni, is the main protagonist of Vinland Saga
He is a former warrior of the Askeladd band, and the son of Thors, the most famous Jomsviking warrior until his defection. Thorfinn is related to the leadership of the Jomsvikings through his mother Helga, who is the daughter of Chief Sigvaldi and the niece of Thorkell.
After attacking Canute in a rage when the latter killed Askeladd, the death of which was Thorfinn's goal for most of his life, Thorfinn was enslaved as a punishment. Four years later he gained his freedom and changed his life. He is currently a traveling merchant working with Leif Ericson and attempting to colonize Vinland.
Thorfinn's appearance is pretty consistent throughout the story. He has bushy hair, old clothes, two knives, and a rebellious, angry face. He is also relatively short.
When Thorfinn was a child, he had a happier face, round with bright, curious eyes, and well-kept hair.
He has a somewhat slight build that belies his strength.