Olaf is a viking of Torgund's clan. He appears in the season 2 episode "Chapter 4: The Eternal Warriors" and the tie-in novel "Hilda and the White Woff" . The character does not appear in the graphic novels.
Olaf is bald, but has a white/blonde beard. He wears an eye patch, and is missing his right arm, which he has replaced with a wooden prothesis.
Not much is known about Olaf's personality, other than that, like his fellow vikings, he wants the Medallion of Sigurd to get rid of his fear.
It is unknown how and when Olaf lost his arm and eye. When first seen, he, along with the rest of his clan, has been trapped in an endless fight against their rivals, the Knudsen clan, over the Medallion of Sigurd. Each night the two clans fight, after which the winners take the Medallion, and Sigurd secretly brings the defeated vikings back to life so they can reclaim the medallion.
Olaf is seen participating in a battle twice; the first time his clan wins, the second time, they loose and he gets killed. Like so many times before, he is brought back to life by Sigurd, but this time Hilda encourages Sigurd to tell the truth and stop his revenge. Olaf is last seen when he and his clan begin to test the potion that Sigurd used to revive them.