Canute is introduced as the seventeen-year-old second prince of the Danish kingdom, a young man who appears timid, weak, and strikingly feminine in appearance. Raised in a sheltered environment under the care of his devoted retainer, Ragnar, he rarely speaks to anyone else and is deeply influenced by his Christian faith, often calling upon a heavenly father he believes in with absolute conviction. His delicate and androgynous looks, with long blonde hair, lead many vikings to mock him, questioning his ability to ever become a true king. At this early stage, he is unable to function without Ragnar and seems entirely out of place in the brutal world of warfare and political scheming.

This passive nature undergoes a complete and dramatic transformation following the death of Ragnar, an event orchestrated by the mercenary Askeladd to force the prince to mature. Confronted with the loss of the only person who showed him unconditional love and the brutal realities of a world he believes God has abandoned, Canute experiences a sharp reversal of personality. He sheds his former shyness and develops a commanding, kingly demeanor, becoming openly hostile toward the religion he once cherished. No longer a frightened boy hiding behind others, he reveals a cold, ambitious, and highly charismatic individual driven by a grand ambition to create a utopia on Earth, a paradise of peace and prosperity that he intends to build through his own will. He becomes convinced that the sacrifice of royal figures and even innocent civilians is a necessary cost to achieve this vision of an ideal society.

His central motivation becomes the creation of this earthly paradise, believing it is his duty as the future king to forge it with his own hands rather than waiting for divine intervention. This seemingly noble goal stands in stark contrast to the ruthless methods he employs to achieve it. He plots to overthrow his own father, King Sweyn, and his brother Harald, razing anything he deems unfit for or resistant to his new world order. As he ascends to become the King of England and Denmark, his rule is marked by extreme pragmatism; he uses poison, assassinations, and clever political schemes to eliminate enemies and consolidate power. His role in the story often positions him as a foil to the protagonist, Thorfinn. Both desire a peaceful world, but their ideals are contradictory, with Canute believing paradise requires forceful, top-down control and the sacrifice of the few for the many.

Canute's most significant relationships are catalysts for his evolution. His deep, almost childlike dependence on Ragnar defines his early life, and Ragnar's death is the single most traumatic event that triggers his awakening. Askeladd, the cunning mercenary leader, acts as a dark mentor, purposely shattering the prince's sheltered world to forge him into a ruler. The relationship with Thorfinn is particularly complex; as the warrior who becomes his bodyguard, Thorfinn is the first person to directly defy and provoke him, and their shared youth and opposing ideologies create a lasting tension. Years later, when they reunite, Canute is bemused by Thorfinn's transformation into a pacifist, yet their encounter forces both to confront the nature of their parallel goals.

Throughout the narrative, Canute's development is defined by his transition from a fragile prince to a formidable and authoritarian king. His physical appearance changes to reflect this inner shift, as he cuts his long hair into a short bob, grows a beard, and bears a scar below his eye left by Thorfinn. He begins to suffer from hallucinations, holding conversations with a vision of his deceased father, King Sweyn, who exposes his hidden ambitions and corrupt actions. This psychological burden illustrates the weight of the crown, which he believes possesses a will of its own that demands the constant acquisition and use of power.

In terms of notable abilities, Canute is not a frontline warrior in the traditional sense like Thorfinn or Thorkell. His true strength lies in his cunning intellect, charisma, and strategic mind. He is a master schemer who prefers to eliminate his enemies through indirect means such as poison and political maneuvering rather than direct combat. Later in the series, he does take up sword practice and becomes a decent fighter, but his power is rooted in his ability to command, manipulate, and inspire loyalty from those around him. Armed with the resources of the vast North Sea Empire, he wields authority and military might as his primary weapons, making him one of the most powerful and terrifying figures in the world of Vinland Saga.