Trond is a wealthy Norwegian businessman with a penchant for contraband, who hires Jazz for a risky job. His motivations center around providing a better life for his paralyzed daughter in the lunar environment.

Ammar is Jazz's father, a skilled welder known for his strong work ethic and independence. His relationship with Jazz is strained, but he remains supportive and caring.

Ngugi is the administrator of Artemis and a key figure in the colony's establishment and management. She is admired for her ability to bring in investment and balance power on the moon.

Svoboda is an enthusiastic Ukrainian scientist living on Artemis, known for his excitement about technology and inventing. He shares a close friendship with Jazz that evolves throughout the story.

Rudy is Artemis's head of security, a former Royal Canadian Mounted Police officer with a strong sense of justice. He plays a pivotal role in maintaining the colony's law and order.

Dale starts off as an adversary of Jazz but later becomes one of her allies. He is notable for his loyalty and understanding of Jazz's character.

Bob is a former marine and the head trainer of the EVA Guild on Artemis. He is a strict enforcer of rules and has a significant impact on Jazz's development as a character.