Ryan Sumner is a 30-year-old man living in Lake Forbing, Louisiana. Raised by his grandparents, he inherits their home and business in the black market. Outwardly a perfect partner to Evie, Ryan reveals a dual personality: loving at home but cold and controlling in business. His openness about his hidden life influences Evie's development.

Mr. Smith is the static antagonist of First Lie Wins. As a manipulative crime boss, he coerces people to work for him, maintaining power through anonymity. Using the alias George, he acts as a shadowy influence in Evie's life, with his controlling and distrustful nature ultimately leading to his downfall.

Devon is Evie's co-conspirator and an MIT-educated hacker, primarily working in the background of Evie's jobs. He is highly secretive and cautious, contrasting with Evie's risk-taking nature. His character develops throughout the novel, becoming more involved and integral to Evie's plans. His role underscores the theme of community and connection.