To answer this, you simply need to scan the chapter and make a list of those you see as you scan. It would be helpful to also write a short description of the character, so you can remember them as you read the novel. If you haven't already read the chapter, this will be hard to do, but it is beneficial. Documenting the page number as you are meeting the character for the first time is also very helpful in keeping them all straight.
Explanation: Tone is achieved through word choice (diction), sentence construction and word order (syntax), and by what the viewpoint character focuses on.
