Although she has been around since 2008 (season 2) in the comics, Rachel only showed up very infrequently and was never a developed character. Only having two appearances in the 2010 comics (season 3) with no spoken lines, Rachel was almost dropped from the series because she added nothing to it. I did not want to drop her because I wanted to keep her brother Ryan, and so Rachel was written into the movie script, even though she still didn't do much there either. When Shannon Asprooth was cast to fill in for Rachel White (who unfortunately couldn't commit to the schedule) Rachel had to be given a new characteristic to give her some importance to the story, so it was decided that she was super smart and in the same grade as her older brother. This trait was one of the few things that carried over from the movie into the 2012 comics, which gave Rachel her much needed break. Happy Birthday, Rachel!
