Jynn first appeared during the Chaos Festival at which Serin Zon Gerhardt attended nigh his thirteenth birthday.
She has no family. She is alone, save for the gypsies she travels with, among which is The Song.
Jynn is part of one of the memories Serin has solidified in The Magic Sword. Her strength in being alone is what reminds Serin that being alone is something you can do, even at such a young age. When Serin is alone, and feels it. really feels it, he hopes that he can turn to that memory and find some strength to get him through it.