The Secret Life of Walter Mitty
The author's text structure defines Walter Mitty's characterization by having no confidence, he's treated unfair and he is very imaginative.
First, Walter Mitty has no confidence. He let's people push him around like when Mrs. Mitty yells at him for driving to fast and he doesn't say anything back to her.
Secoundly, Walter Mitty is treated unfair. He's treated unfair by people in real life like the parking attendant having an attitude and being rude to him.
Lastly, Walter Mitty is very imaginative. He has multiple dreams in this story because he wants to be treated differently in real life. In his dreams he always stands up for himself , he does not do that in real life.
This is how the authors text structure defines Walter Mitty's characterization.