The younger brother of the narrator, a medical student in London who provides a perspective on the invasion from the city and engages in a daring escape.

A clergyman from near Weybridge who becomes emotionally overwhelmed during the invasion and ends up trapped with the narrator in a damaged house.

A soldier encountered by the narrator twice, who goes from struggling after his regiment's collapse to envisioning ambitious plans for humanity's survival.

A minor character whose safety and well-being drive the narrator's actions, providing motivation throughout the story despite her minimal presence.

Two women who the narrator's brother assists during the evacuation from London, characterized by their contrasting responses to the chaos; Mrs. Elphinstone is incapacitated by fear, while Miss Elphinstone bravely takes charge.

An astronomer and the first character to observe unusual activities on Mars, initiating the chain of events leading to the Martian invasion.