A young man with black hair and purple eyes, Harrison is the captain of the eighth unit of the Knights of the Kingdom of Freysia. He shares an age with Alan Berners and Callum Bordeaux, making him nine years older than Princess Pride. His late entry into knighthood, a full two years after his peers, hints at the unusual and violent path he walked before taking his vows.

Harrison’s personality is defined by a striking contradiction: he is a battle fanatic who craves combat, yet beneath this ferocity lies a deep and unyielding loyalty. He is described as eccentric and reticent, often finding it difficult to communicate with others. This silence frequently leads to misunderstandings about his intentions. His extreme form of training involves ambushing his own subordinates under the guise of skill checks, an approach so brutal that he was once nearly expelled from the main order and even had a recruit sent to the emergency room. In the heat of battle, he is known to lose control, hacking at enemies until they are unrecognizable, driven by a philosophy that he is testing their resolve to join his world.

This savage disposition is rooted in a tragic childhood. Raised in a slum by an abusive father, Harrison grew up in a lawless environment where violence was the only language and the only path to survival. His life changed at the age of seven when he witnessed a knight in action. For the first time, he saw violence used not for cruelty, but to save and protect people. This moment became his lifelong aspiration. He trained relentlessly in the criminal underworld to hone his skills, dreaming of becoming one of those heroes. However, upon joining the knights, his ingrained brutality caused friction. He was eventually subdued by Clark, who personally took on the education of this problem child, and later by Roderick, who ordered him not to betray Clark's expectations. Both men became not just mentors but objects of immense gratitude for Harrison, who cherishes a debt of honor more than anything.

Within the narrative, Harrison serves as the captain of the eighth squadron, a unit specifically described as a collection of outsiders and eccentrics where individual action is prioritized. He plays the role of a fiercely loyal warrior beholden to his commanders, Clark and Roderick, and later to Princess Pride. His loyalty is absolute: once he feels indebted to someone, he follows them without question, waiting patiently for years to fulfill a perceived duty. A reader of the source material noted that Harrison’s perspective was particularly enjoyable, hoping he would receive recognition from his commander and the Princess.

In the timeline of the doomed game world, Harrison’s loyalty turns into tragic ruin. After Pride becomes a tyrant and most of his comrades are killed, he spends years enduring insults in silence, following the directives of the tyrant solely to preserve Clark's dying will to protect Arthur. Having kept that promise, he sheds his identity and makes a final, solitary attempt to assassinate Pride. He is ultimately killed by her overwhelming power, dying with the relief that she never recognized him—thus keeping his fellow knights from being implicated in his treason.

His development as a character is one of learning to sublimate raw violence into discipline. While he remains a terrifying combatant, he actively tries to follow Clark’s teachings, becoming slightly more relaxed and accepting of authority as he ages. He reluctantly takes on guard duties for Pride, working to overcome his trauma of nearly being expelled as a recruit. Despite his seeming impatience, he possesses a surprisingly dogged patience, capable of waiting seven years for the right moment to act. His abilities in combat are formidable. He is a warrior who, according to the official announcement for the second season of the anime, is being introduced as a key addition to the expanding political and military conflict of the kingdom.