Are you talking about the first installment, or the series as a whole? While for the former, it isn't really required, it's good to have some
obvious character development by the very end. It's unrealistic to have a young character go through a lot and come out the same.
Now, for Manifestation Files (besides inciting incidents for the character arcs):
For Bryan, it's when he gains his psychic powers, kills a Prime, and get her goo all over him.
His life changes from there.
For Finn, it's a little later, either during the brightest moment or during the darkest moment.
Amy's? I still need to define her character arc (I have a few ideas from Draft 2 to structure it), but let's say she doesn't take death very well. In a milder extent, it's when she reveals her powers to Bryan, which sparks up the romantic arc.
For minor characters, Jeb's turning point is when he attacks one of the other characters. Kyle's is going to be somewhere when Finn replaces him as Bryan's best friend. Scout? Wait for next book.
edited 25th Oct '11 1:56:38 PM by chihuahua0