In keeping with the blogosphere's biggest thing going right now (that would be the a-z blogfest) I give you the letter H for Hero or Heroine.
That's your main character, whoever he or she may be. You might even have two main characters, or, if you're George R. R. Martin (Song of Ice and Fire), you might have many characters. Whoever they are, they're probably the good guys, the people who will change and be changed by the events in the story. Your readers will be rooting for them, worrying over them, possibly even blogging over them! So you best make them worthy and give them helpful attributes that will aid them on their journey - but not too helpful, because that journey needs to be a challenge. In fact, I suggest giving them at least one hindering characteristics. It doesn't matter what but make sure they're not perfect because no one likes to read about perfect people; they're a bore. And remember, sometimes the most flawed heroes are the most memorable. Like Lestat in Interview with a Vampire and The Vampire Lestat. Anne Rice masterfully gave us a vampire to despise in the first book and then turned him into a hero in the second. Now that's magic.
Who is the hero in your story? Care to share? If so, send me 250 words about your mc from your current wip. I'll post the first four I receive here this week.