The monster was kind to the little girl and was shy around her. With the boy, however, he became the monster he was created to be. At the slightest provocation, he killed the boy.
it shows that although the monster has the capacity to show kindness and be heroic, (Paragraph 19), it cannot be trusted when it is unhappy, fatigued, or angered. (paragraph 25-32)
Character Development process of creating or creating the personality of a fictional person.
Because the character has a personality, the reader is exposed to the depths and motivation that drive them (the character, that is) and hence, the plot as well.
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