A stark contrast to his best friend Gon, Killua is highly mature in both thinking and emotion. He can keep his anger in check and maintain rationality better than Gon even when facing a terrifying experience.

Lydia (mother) A cunning, mysterious Viking who commands a mercenary band of vikings, of which Thorfinn is a member. Askeladd is a tactical genius and a master swordsman. His ability to manipulate those around him turned a horde of pirates and raiders into a close-knit group loyal to him, as well as proving him capable of turning enemies into allies, as seen with Thorfinn, Thorkell, and Prince Canute. Askeladd is named after the Norwegian fairy-tale character Askeladden, known for his cunning nature and cleverness. (Source: Vinland Saga Wiki, edited)