Well, the character of Robert Langdon stands out. He's not only intelligent but also brave as he delves into the dangerous world of the novel's mystery. Vetra is also very important. Her work and her beliefs are at the heart of the conflict between science and religion in the story. Additionally, the Hassassin is an important character. He is a menacing figure, an assassin who is part of the web of danger and intrigue that the other characters have to navigate.