Answer:
No. A characteristic is something you possess like she is smart, he is witty, you laugh everyday, he is kind, they are determined, she is passionate.
A main idea is more of writing term as in "What is the main idea in your paper?" If you were asked that about a paper about The Renaissance
You would say, "The Renaissance."
Or go in more depth like, "The main idea is the Renaissance I transition into from the Dark Ages and go into depth about the writers, artists, and musicians."
Explanation:
Hope this helps!
Third person is when a story is narrated by one of the characters. If you only know the narrators thoughts, then it is third person limited. If you know others thoughts as well, then it is third person omniscient.