Tip #267: MG/YA characters

Middle grade characters are focused internally; it's about self-growth, learning who you are. Young adult characters are focused more externally, noticing the world around them and how they fit in, how they affect things. Often, that's a huge part of a YA character's growth throughout his or her story; moving from a naturally selfish stage in life to becoming more aware of the feelings and situations of others.

http://www.yahighway.com/2011/05/5-fast-differences-between-ya-and-mg.html