In literature, the term tone refers to the writer's attitude or feelings about the subject matter as well as towards the audience. Such tone is created by authors through the use of literary elements, such as diction( defined as word choice), syntax ( or the grammatical arrangement of words), imagery ( referred to the vivid appeals to the senses); details (related with facts that are either included or omitted) and figurative language (which refers to the comparison with apparently unrelated things.
In the particular segment.. “He was tall, gaunt, with a pale skin and sunken eyes the color of a kingfisher's wing, neither blue nor green...” details and figurative languages seem to be used by the author as literary elements to express his/her attitude towards Kenny, which could be categorized as indifferent
While describing Kenny, the narrator uses a mysterious tone. The narrator most likely uses this tone to create traits of Kenny. The description of Kenny makes you think of him as tough, or mysterious. Its used to create your impression of him. The narrator uses physical description rather than personality descriptions, to create a “Unknown” vibe to him. “…with a pale skin…” most likely reference that he’s supernatural. Although people can have pale skin, pale skin is often used in stories to create an unnatural being; zombies, monster, etc. “He was tall, gaunt…” creates a tough tone. All of this is important because it adds on to the central idea of the passage. Tone is important because it helps develops the vibe and the theme of the story. From observation, this is most likely an excerpt from a mysterious passage. You can use the tone, word choice, and message to more understand the passage.