Indirect characterization is the act of showing instead of telling.
All four would be examples of indirect characterization of a main character, because the writer isn't telling us, or giving his/her opinion on the character, he is painting a picture for the reader, showing instead of telling.
Telling a reader how a character dresses or what his inner thoughts are, shows the reader what the character is like, as opposed to saying. He seemed afraid you would say, 'he worried about what was going to happen.'
All four would be great examples of indirect characterization