In the book "The Son of Neptune" by Rick Riordan, Frank Zhang is characterized as a somewhat clumsy individual, reflecting his persona as a "lumbering klutz." As a child of Mars, he possesses a strong warrior heritage but struggles with his self-image and abilities. His description also humorously includes the term "part-time pachyderm," which suggests he may feel heavy or awkward, adding depth to his character and showcasing his internal conflicts.

Frank's background as a demigod and his connection to the Roman god of war play a significant role in the storyline. Despite his self-doubts and cumbersome nature, he is portrayed as a character who will ultimately confront challenges bravely. Readers can relate to his vulnerabilities while appreciating his potential for greatness, making him an essential figure in the narrative as they explore themes of heroism and identity.