In literature, character voices often help differentiate characters and give them unique personalities. Some examples include:
Holden Caulfield from The Catcher in the Rye by J.D. Salinger, who speaks with a casual, sarcastic, and introspective tone.
Sherlock Holmes, as portrayed by Arthur Conan Doyle, who has a precise, analytical, and confident voice.
Tom Sawyer from Mark Twain's novels, who has a mischievous, adventurous, and youthful voice.