That's part of it. Try asking yourself questions about your charaters. What hobbies does this person have? What is their home-life like? Are they quiet? Or talkitive? Think of your characters as real people. Real people have different personalities, tastes, experiences, views, ect. Write your charaters like that. Remember, if something isn't important to the story don't include it.
Leilani may love to sing (or whatever) but if her singing never helps to move the plot along it's not important and should be cut.