
Originally Posted by
Rhyis.
Forget the other books. Peter was important in Ender's Game because he is literally the basis for every doubt Ender has about himself throughout the entire book.
Kicked the crap out of that kid from school: Shit, I'm turning into Peter. Need to be better.
Kicked the crap out of that kid going to battle school: Shit, I'm turning into Peter. Need to be better.
Kicked the crap out of that kid in the bathroom: Shit, I'm turning into Peter. Need to be better.
Sees Peter's face, not his own, in the mirror of a game that reads your mind: Shit, this game thinks I'm turning into Peter. Need to be better.
Peter was Ender's drive to be a human being, and not a monster whose sole purpose was for killing. Despite the fact that's exactly what he was bred for, and knowing full well that's what he was bred for.