An authoritative figure on the Wall, the Captain initially serves as a mentor to Joseph, providing strict guidance for survival. He is a formidable and stoic presence who helps Joseph navigate the harsh realities of life as a Defender.

A reclusive and resourceful man who lives in isolation in an energy installation. He aids Joseph and Hifa by sharing his resources and survival story through written notes.

Joseph’s romantic interest, a pragmatic woman with dreams of making life bearable on the Wall by encouraging procreation. She is known for her skilled work and use of nets in their floating community.

A fellow Defender who is a thoughtful and intellectual contrast to Joseph with a shared resemblance. He balances living in the present with planning for the future and is known for his survival skills during attacks.

An ambitious young politician who initially draws contempt from Joseph for his lack of authenticity. Joseph seeks to align with him as a means to achieve his own aspirations of power and privilege.

The cook for Joseph’s company, known for her friendly disposition towards her peers and dream of opening a restaurant. Her role is largely defined by her duties in the kitchen.

Joseph’s term for his parents' generation, symbolizing those who avoided confronting climate change seriously. They are characterized by their apologies and ineffective responses that fail to address societal issues.

A hardened Defender and mentor to Joseph who embodies the no-nonsense style of leadership. He guides new recruits with experience from his previous tours on the Wall.