Gender: Male Age: 5 years old Appearance: Potato-shaped head with short black hair, black eyes Family: Mother Misae, Father Hiroshi, Younger sister Himawari Calls Misae 'Mom' and Hiroshi 'Dad'.

Gender: Female Age: 29 years old Appearance: Brown wavy bob, black eyes Family: Husband Hiroshi, Eldest son Shin-chan, Eldest daughter Himawari Calls Hiroshi 'Honey'.

Gender: Male Age: 35 years old Appearance: Short curly brown hair, black eyes, short beard Family: Wife Misae, Eldest son Shin-chan, Eldest daughter Himawari Calls Misae 'Honey'.

Gender: Female Age: 0 years old (Newborn) Appearance: Light brown wavy bangs, black eyes Family: Mother Misae, Father Hiroshi, Older brother Shin-chan Still young and can only babble.

Gender: Female Age: Unknown Appearance: Straight navy blue hair, black eyes Affiliation: Hot Spring Guard Onyang is a codename. Calls the Chief 'Commander'. She is Yuseong's junior (Onyang is the junior, Yuseong is the senior).

Gender: Female Age: Unknown Appearance: Straight orange hair, black eyes, wears lipstick Affiliation: Hot Spring Guard Yuseong is a codename. Calls the Chief 'Commander'. She is Onyang's senior (Yuseong is the senior, Onyang is the junior).

Gender: Male Age: Unknown Appearance: Slightly reddish skin, short black hair, black eyes Affiliation: Hot Spring Guard He can tell which region a hot spring's water is from just by dipping a finger in it. He is the leader of the Hot Spring Guard.

Gender: Male Age: 51 years old Appearance: Short white hair, black eyes Affiliation: YUI (Yesterday Once More / Anti-Bath Organization) He started hating baths when he lost a card key featuring his favorite player's jersey number. He is the leader of YUI. He planned the Global Hot Spring-ization Project.

Gender: Female Age: 32 years old Appearance: Wavy pink hair, black eyes, wears lipstick Affiliation: YUI She is Dr. Akmamire's lover.