Indirect: Likes to read
Montag is indirectly characterized as "likes to read". An example is that for his job, he burns books and he is not allowed to keep books. But he disobeys the rule and takes books and reads them secretly. Even when the Beatty, the fire cheif, comes he keeps it a secret. It does not explicitly tell us he likes to read, we gather up info to tell us that.
Direct: Good Listener
Montag was directly characterized as a good listener. One example is when Clarisse said he was different from everyone else, that he listens to her and everyone else doesn't have time to listen to her. This is an example because the words were explicitly spoken by a character. the readers does not need to gather up a lot of info to figure that out.