A person with a positive attitude is called an optimistic person.
A person in a story is called a character.
When a person has direct physical control over an object, it is called "possession." Possession refers to the physical control or holding of an object by a person.
A lay witness is a character witness or other person who is called on to testify and is not considered an expert.
Objectification
The third person with one character is called a limited narrator
We would call it the person or object's "weight" on that planet.
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Character
When a person has direct physical control over an object, it is called physical possession.
When a person makes an object for the first time, it's typically referred to as "creating" or "crafting" the object.
This is called displacement, where emotions directed toward one person or object are redirected to another person or object.