Name: Kei Gender: Male Age: Early to mid-20s Occupation: Medical student -> Graduate student Appearance: Yellow hair tied low, dark green eyes Traits: Severe mysophobia. He is the sub-protagonist.

Name: Geo Gender: Male Age: Early teens Height: 150cm Appearance: Navy hair with black sanpaku eyes Traits: Has incredible stamina for an elementary schooler. He is the protagonist.

Name: Pipi Gender: Female Age: Early teens Height: 150cm Nickname: Jungle Girl Appearance: Red hair with black sanpaku eyes Traits: A glutton. She eats a tremendous amount.

Name: Dr. Ady Gender: Female Age: Mid to late 20s Appearance: Brown hair and black eyes (freckles on both cheeks) Traits: A doctor at a tropical disease research center in the remote African wilderness. She was Dr. Brain's student, and is Kei's university senior and first love.

Name: ? Gender: Female Age: ? Appearance: Red hair and dark gray eyes Traits: Her skin is bright, not dark like Pipi's.

Name: Dr. Brain Gender: Male Appearance: White hair with sanpaku eyes Traits: Just an ordinary doctor.

Name: Kenji Gender: Male Appearance: Dark light-brown hair and dark light-brown eyes Traits: Appeared in the Abnormal Climate and High-Rise Building survival series. Geo's group saved him when he was on the verge of death from heatstroke. He is a Japanese boy.

Name: Seo Dong-gyeong Gender: Female Occupation: Cellist Appearance: Long yellow hair and dark gray eyes Traits: Pipi was originally the main heroine of the Geo series, but she appeared as the main heroine instead of Pipi in High-Rise Building and Abnormal Climate. She is often seen with Kenji, appearing in the same panels.