If an author just blasts the reader with their opinions, it's not a story but a monologue or lecture. Using characters to say your opinions makes the reader more likely to read them and think about them.
Authors create characters who are different than themselves because they are more interesting to the author than writing about themselves. Fictional characters can be anything you want them to be.
Certainly, authors often use characters whose opinions are different from those of the author. It would hardly be a good idea to write a work of fiction in which every character is actually the author in disguise. Authors have to be able to write about a wide variety of characters with a wide variety of opinions.
Characters do what they do because the author thinks they should. Good authors have their characters do logical things that real people would do in similar circumstances.
Yes, interactions between characters are a tool used by authors to reveal their personalities, relationships, and motivations. By showcasing how characters speak and behave around each other, authors can provide insight into their dynamics and develop them more fully as individuals within the story.
Authors create multiple characters to add depth and complexity to their stories, provide different perspectives, drive the plot forward, and create conflict and tension. Characters with distinct personalities and backgrounds can make the story more engaging and dynamic.
Characterization
All of the above. Authors use a combination of the characters' private thoughts, speech, and the opinions of other characters to develop characterization and create well-rounded, dynamic characters. By utilizing these elements, authors can provide insight into the character's personality, motivations, and development throughout the story.
Authors often use physical appearance, personality traits, actions, dialogue, thoughts, and interactions with other characters to describe their characters in a story. These details help readers form a mental image of the character and understand their motivations and role within the narrative.
Tinkerbell is fictional. Fiction characters can have any attributes given to by their authors.
Authors use characterization techniques such as dialogue, actions, inner thoughts, and interactions with other characters to provide insight into a character's perspective. By showing how characters respond to events and challenges, authors allow readers to understand their motivations, desires, and conflicts, contributing to a deeper understanding of their point of view. Through these details, readers can develop empathy and connect with the characters on a more personal level.
You can find the names of Saki's characters by downloading his works works, free, at http://www.gutenberg.org/browse/authors/s
Atticus