Final answer:
Fully-developed characters in fiction require details such as backstory, inner thoughts, hopes and dreams, and patterns and habits.
Step-by-step explanation:
In order to create fully-developed characters in fiction, several details are crucial. These include backstory and inner thoughts, which provide insight into a character's past and motivations. Additionally, hopes and dreams can reveal a character's desires and aspirations. Lastly, patterns and habits showcase a character's behavior and personality.
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