Will is noted as having a surfer-body, shaggy curly blond hair, blue eyes, and having an athletic build. His appearance reminds Nico of Jason Grace in The Blood of Olympus. He typically dresses casually in a T-shirt and shorts.[4] Rick Riordan has stated that Will is in Nico's age group, making him about 15 years old.[5] In The Hidden Oracle, Will estimates Apollo's appearance as Lester to be about his age, fifteen.

In The Tower of Nero, it is revealed he has a stylized sun tattoo 