on The Write Practice:
When we read books, books with characters we love, we can learn how to write our own characters by studying what details the writers included. There are so many details about your characters you could include in a character description, but which ones do you need?
When you write a story, you want your readers to believe that the characters you create are real. Well, I assume that is what you want. I hate when someone tells me what to think.
Except for Stephen King; he can tell me what to think about writing characters.
Here are the tips about character description King gives in his book, On Writing: A Memoir of the Craft.