Bojji is the first prince of the Bosse Kingdom and the central character of the story. He is the son of the powerful giant King Bosse and his first wife, Queen Sheena, also a giant. Despite his pure giant heritage, Bojji was born with a frail and remarkably small body, lacking the immense physical strength typical of his kind. This condition is the result of a demonic contract made by his father before his birth, which transferred most of the prince's natural strength and stature to King Bosse. This curse also rendered Bojji deaf and unable to speak, forcing him to rely on sign language and lip-reading to communicate with others.

In terms of personality, Bojji is defined by his unwavering kindness, humility, and extraordinary determination. He faces constant ridicule and dismissal from his subjects and the people of his kingdom, who view him as a weakling unfit to be a king. Despite this, he maintains a positive and gentle disposition, often responding to cruelty with a tearful but genuine smile. His empathy is a core trait; he shows compassion to nearly everyone he meets, including creatures that harm him and individuals who have betrayed him. He is an all-loving hero who forgives actions that others would hold as lifelong grudges. This inner strength is the source of his true power, as he simply refuses to give up on his dream no matter how many times he fails or is told he cannot succeed.

Bojji's primary motivation is to fulfill his late mother's wish and become the greatest king in the world. This goal drives him to overcome his physical limitations and prove his worth to those who doubt him. His role in the story is that of an unlikely hero and a supporting protagonist. He embarks on a journey of self-improvement after being denied his birthright to the throne. Through his actions and sheer force of will, he inadvertently inspires profound change in the people around him, turning former enemies into loyal allies and challenging the kingdom's values that prioritize brute strength over character.

His key relationships are fundamental to his development. His most important bond is with Kage, a survivor of the shadow clan who initially tries to rob him. Kage becomes Bojji's first true friend and most loyal companion, offering constant support and encouragement. His relationship with his younger half-brother, Daida, is complex; Daida initially looks down on Bojji but eventually comes to respect and emulate his kindness. His stepmother, Queen Hiling, also grows from being dismissive to a fiercely protective figure who uses her healing magic to save him. Under the tutelage of the wise instructor Despa, Bojji hones his natural agility into a lethal combat style, learning to strike enemy weak points rather than relying on raw power.

Bojji undergoes significant development, transforming from a sheltered, crying prince mocked by his own people into a confident and capable warrior. Initially, his fighting style of dodging and striking is considered cowardly, but he learns to refine it into a legitimate and formidable technique. He experiences deep trauma from betrayal, yet he never allows it to harden his heart. By the end of his journey, he proves his courage and skill, earning the recognition and respect of his kingdom and even becoming king, though he ultimately chooses a different path, deciding to travel the world with Kage to create a new kingdom from scratch based on his own ideals.

Despite his lack of strength, Bojji possesses several notable abilities. His most prominent skill is his incredible speed and agility, allowing him to dodge attacks effortlessly and perform feats like running up walls. He has an exceptional ability to sense attacks, often reacting to the breeze of an incoming strike. Under Despa's training, he masters a fighting style focused on precision, using a thin rapier to strike vital points with enough force to knock out or even kill opponents much larger than himself. He retains one trait from his giant heritage: an incredibly resilient digestive system that makes him immune to most poisons and allows him to eat virtually anything.