An immortal being cast onto the earth by the 'Beholder.' Originally a 'sphere' without emotions, he changes form based on stimulation from his surroundings. Through many encounters and partings, he acquires a human heart and intelligence. Abilities: Possesses an immortal body and the ability to replicate and transform into objects or creatures that have provided a strong stimulus. Origin of Name: Named 'Fushi' by March because he does not die (fushi). Journey and Growth: The story depicts Fushi's journey to understand the world through repeated 'preservation' and 'inheritance.' Early Stages: Acted like a wild animal driven by instinct, but learned language and how to eat through meeting March and others. Conflict: Throws himself into battle against the 'Knockers,' mysterious enemies that threaten his existence and seek to steal the memories of his companions. Internal Change: As the journey continues, he learns the pain of losing loved ones, eventually harboring deep compassion and inner conflict.

Played a 'motherly' role for Fushi. An energetic and kind-hearted 5-year-old girl living in Ninannah. She was the one who gave Fushi the chance to learn how to live—teaching him language and how to eat—and her encounter with him formed the foundation of Fushi's humanity. Personality: A caring girl with a strong sense of responsibility. She loves playing house and dreams of growing up to become a mother. Origin of Name: She is the godmother who gave Fushi his name. Role and Influence: Education of Fushi: She taught the wordless Fushi table manners, greetings, and emotions like pain and kindness.

A foster parent figure to Fushi and a traveling companion. An elderly woman who was held captive in the land of Yanome, she served as a guide who taught Fushi language, writing, and how to live as a human being.

A young boy who becomes like an 'older brother' to the protagonist, Fushi. Circumstances: As a child, he was crushed while trying to save a noble's daughter, suffering severe injuries to his face and body. Abandoned by his brother Shin and falling into despair, he was saved by Beer Grandpa (Sake-jii). Appearance: He always wears a large mask (a jar-like headpiece) to hide his disfigured face. Abilities: Fire-breathing. Through reconstructive surgery by Beer Grandpa, a bag for storing alcohol was created in his stomach. By utilizing this, he can spray alcohol from his mouth onto a torch's flame to perform powerful fire-breathing attacks. Relationship with Fushi: While agonizing over his self-perception as a 'monster,' he meets the similarly inhuman Fushi. He builds a strong brotherly bond with him while teaching him cooking, weight training, and survival skills. Role in the Story: The person who gave Fushi the opportunity to deeply understand pain and the love of a family.