Silk's father. Possessing superhuman scientific knowledge and rationality, he has a "cool but hot-blooded" personality that puts his friends first. While he may appear arrogant and cold at first glance, he is fundamentally kinder than anyone else, striving with an indomitable spirit to rebuild human scientific civilization from zero.

Silk's mother. She has a kind and compassionate personality, always looking out for those around her and prioritizing others over herself. Though she is a gentle soul who dislikes conflict, she possesses overwhelming manual dexterity cultivated in the handicrafts club and a core of strength that never loses positivity even in a pinch.

A boisterous, greedy, and confident man who calls himself the "greediest man in the world." However, he is not merely selfish; he is a genius adventurer who combines leadership that "makes both himself and others shine" with exceptional seafaring skills and rational judgment.

An honest and hot-blooded young man who deeply cares for his friends. While he possesses extraordinary durability and stamina, he has a kind heart that hates conflict or hurting others. He shows tough perseverance and a spirit of self-sacrifice to protect Yuzuriha Ogawa, whom he has loved for many years.

A highly intelligent and curious hot-blooded youth who is straightforward in everything he does. A hard worker who taught himself "sorcery" (science) out of a desperate desire to save his childhood friend, he became fascinated by the wonders of science after meeting Senku and grew into a core member of the Kingdom of Science through his flexible thinking.

A brave and hardworking girl who always wants to be "useful to everyone." While she is modest and kind-hearted, she has the inner strength and initiative to help even an enemy if they are in trouble. With her small body and excellent insight, she excels as a brilliant scout for the Kingdom of Science.

She has a strong sense of justice and a tomboyish, frank personality, but is fundamentally a very thoughtful and deeply compassionate person. She usually speaks in an archaic and stiff manner and possesses the greatest combat power in the village, yet she also has a feminine side, caring deeply for her comrades and willing to risk her life to cure her sister's illness.

Kohaku's older sister. She has a serious, graceful, and gentle personality, caring deeply for her sister and the village. As a priestess, she has inherited the "Hundred Tales" passed down through generations, and despite her frail health, she possesses a strong core.