Bjorn

Bjorn

ビョルン
Askeladd's second in command, and his longest-serving and most loyal follower.

Bjorn is an extremely skilled warrior, often using a berserker mushroom to work himself up into a fury, augmenting his strength and making him resistant to pain, though losing the ability to distinguish between friend and foe.

(Source: Vinland Saga Wikia, edited)