Bradbury shows Clarisse as the character that is most out there. She thinks differently and Bradbury does a really good job in showing that. Clarisse says that she is 17 and crazy. This clearly states that she thinks in a way that isn't really custom in that time. She tells Guy that she is not afraid of him, which is why she talks to him. She likes to ask questions, She is bold, brave, and curious which are all characteristics that people don't have in that time period. She also tells Guy to observe the sky and how there is a man on the moon, Clarisse like to look around and observe. That is another characteristic that isn't common during this time. Beatty represents the complete opposite.
Beatty thinks in the most generic way according to Bradbury. He is a fireman that burns books because that is his job. He doesnt get curious to see what he is burning ever. He likes to follow the rules that already exist, for example in the movie "the lego movie" everyone follows the same set of rules. They are more like guide lines, they stay in place and do what they are told. No one is creative or cares about anything going on around them. Just like Beatty, he doenst believe that there is another way to deal with books other than burning them. He also wants to arrest his fellow companion for reading a book and that leads him to his doom. the one interesting part was that Beatty wanted to end his life which is why he provoked Guy to roast him. All this come to prove that Beatty was a generic human being that had nothing going for him unlike Clarisse.
In conclusion Bradburys tone towards Clarisse was nice and showed that she was different from the other characters in the book. Beatty was more of a generic common human being that followed rules there the tone was more dark and negative, which was perfect for setting the mood for the rest of the story.