Choice, when it comes to gender issues in schools, can sometimes be a bad thing. If I were to present two characters as options, girls would tend to pick what they think the culture says they should pick. Boys would do the same. Imagine if a teacher were to provide the option of an American Girls book and a Batman book. Almost all girls would pick what we would expect them to pick, and so would the boys. If we want our kids to be exposed to a wider variety of literature, sometimes we should require they read something that might be considered more typical for the opposite gender. In this case, NOT providing choice gave ALL of my third graders a better reading experience. The main thing to consider when selecting literature is the quality of the literature.
Here is a quick video that shows the introduction to a Batman chapter book. I learned through these lessons that everyone loves Batman!