Tim Charvat is a paraplegic mentor figure for Bud, known for his resilience and engagement with life. He demonstrates that a meaningful existence is a matter of choice and helps guide Bud toward a more connected and joyful life.

Clara is Bud's primary love interest and an unconventional character who is honest about her struggles. She encourages Bud to confront mortality and pursue authentic human connections, influencing his personal development throughout the story.

Tuan Nhat is Bud's officemate and friend known for his caustic humor and practical support. He provides comic relief and steady friendship, looking out for Bud during difficult times despite his prickly exterior.

Howard Ziffle is Bud's boss and a gruff mentor who believes in journalistic integrity and the power of storytelling. His mentorship is crucial to Bud's journey, guiding him toward a more meaningful career and life.

Leo Hoyt is a seven-year-old boy whose friendship with Bud shows authentic human connection. His simple wisdom and honest perspective on life and death provide emotional support for Bud.

Jen Finch-Atwell is Bud's ex-wife, representing his past failures and stagnation following her affair with her boss. Her presence in the narrative serves to highlight the emotional barriers Bud faces.