The answer is:
When the author describes that character in a direct way or manner.
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Answer:
The weather has been nice but, it may snow again any day.
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a person who introduces new methods, ideas, or products
Answer:
Do you mean describe a new student , a new student will generally be to themselves , isolated as they might not know anyone , they may not have any friends and might be scared of talking to anyone as they wouldn't know how to respond . It will be hard for them to accept their new environment and surroundings. They could be thought as being weird but first impressions of a person doesn't exactly mean that they are like that .