I've noticed in a lot of works, notably fantasy, the main character (before the plot picks up) had a normal life. Basically, there is nothing in their past that is essential to the story or needs explaining. Perhaps the circumstances of their birth, but they rarely have a lot going on prior to the storyline. However, there are some who have dark or complicated pasts and sometimes this works while other times the scenes where these pasts are explored slow down the plot and bore the reader. I can't decide whether I want to give my main heroine and protagonist a somewhat complicated backstory or make her life prior to the story as normal as possible. Which one tends to work for you? And can someone give me some examples of when each of these types of main characters are used well?