Since I haven't read this, I really have no idea, but be sure to re-read the questions closely. "What do you think ... " "How does Christopher fit your idea ... " Etc.
There are lots of "you" words in these questions. This means that your teacher wants to know what YOU THINK. So ...
Make sure you are clear on what YOU THINK the word "hero" means:
Make sure you are clear on what YOU THINK the terms "a new kind of hero" and "an unlikely hero" mean.
You must be crystal clear in your own mind about the meanings of these words and phrases before you can begin to answer these questions.
You must also have read the book carefully, and probably even re-read the sections in which this character demonstrates being a "hero."
The reviews in the search results below may help, but probably not nearly as much as reading the book carefully and being clear on the meanings of the terms in the questions.
Plus you may get ideas here, if it's not the same GOOGLE Search.