If you prefer more freedom, the open-ended questions and answers may be more your style. While not everything that an author writes in a character sketch must be included in the novel, the author should develop an in-depth and all-encompassing knowledge of every facet of the character's personality in order to create a consistent and engaging persona.
Your introductory sentence might say something such as, "In the novel 'Of Mice and Men' by John Steinbeck, Slim is the rational voice of conscience in a world where injustice usually prevails. For each trait or characteristic, the writer provided at least one detail that supported -- served as proof -- that Liz possessed that trait.
What is their general view of life? Again, the character used is the same character from the outline above. Include a section in your character sketch about the general way the character talks -- whether he speaks with an accent, tends to mumble or uses incomplete sentences, or constantly uses bad language or offensive slurs.
You want to provide a lasting mental image of the person or character you are writing about. However, the final goal is not to have a notepad full of character sketches. Your character description should answer all the questions that your audience wants answers to: What are the physical attributes of the character?
These paragraphs detail the traits listed as the subtopics from the Introduction. And while there is no one-way approach to writing a good character sketch, you should consider following the procedures explained in subsequent paragraphs.