We don’t just read books for the plots, but for the characters. We are following their lives, listening to their conversations, and even intruding on their most intimate moments. We befriend them and sympathize with what they are going through. Sometimes we laugh at them or we cry with them. Every now and then, we even fear for them. That is why you must treat the characters in your novel as though they are real people in your life. (If they live in your head, they are as good as real.)
When you have a story idea and picked a genre, the next step in writing a novel is to build your characters. All of the characters in your novel need personalities and quirks. Is one of your characters sweet and shy, or mean and dangerous? Bring it out in your writing. For example, a shy character can blush fuchsia, and a mean character can grind his teeth in aggravation.
I gave the butt-kicking female protagonist in my series many of my personality traits like my “god-like” anger and lack of patience –especially when she’s trying to catch a criminal. Could you give your main character a few of your charming (or less than charming) traits?
Your characters also need appearances. After all, you are creating people. Give them hair/eye colors and body structures, but be creative when you are describing them in your book and let your creativity for words shine. Don’t just give a character green eyes and blonde hair.
To read more, including a little project that might help you develop your characters: http://writewithfey.blogspot.com/2012/02/bring-characters-to-life.html