Rona is kind when you first arrive at the hospital, but when she begins her attack inside, she is no longer kind and mocks her victims relentlessly while attacking.

A 13-year-old tsundere boy. The eldest of the three siblings: Luke, Nana, and Roby. He came along because Nana was sick. Luke finds this hospital creepy and tries to flee, but Rona blocks him and sends him to the basement with the other children.

A 12-year-old girl. The middle child of the three siblings. She came because she wanted to be treated by Rona. She likes Rona, but to Rona, she is just another annoying human. She has a cough and a cold.

A 10-year-old boy. The youngest of the three siblings! He is cute, a total coward, and a scaredy-cat. He came along with his older sister Nana.

Ross is prickly but becomes kind once you get close to him. He has a younger sister named Blue Snow. He is a male, estimated to be between 10 and 19 years old. He is planning an escape with other survivors to get away from Rona.

A young girl, estimated to be between 6 and 9 years old. She has an older brother named Ross and is a cute younger sister. She is planning an escape with the other survivor patients to flee from Rona.