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A person with a positive attitude is called an optimistic person.
A person in a story is called a character.
Objectification
A lay witness is a character witness or other person who is called on to testify and is not considered an expert.
The third person with one character is called a limited narrator
Character
Character(((:
A bangelierre
We would call it the person or object's "weight" on that planet.
Personification
Anthropomorphism.
When a person has direct physical control over an object, it is called physical possession.