The phrase was borrowed into English in the 1500s by people who made a formal study of logic. For them it meant a conclusion that does not follow from the statements that lead to it. But we now use non sequitur for any kind of statement that seems to come out of the blue
Answer:
Everyone is an indefinite pronoun
Explanation:
It does not refer to a specific person place or thing, its not definite.
A theme could be to never give up and have couage and a clear example of this theme can be with the main character herself. Poppy never gave up and with every challenge she went through it bravely and showed everyone that she was brave.
You should fine certain quotes to back up this theme, so you can have proper evidence.