The Harry Potter Alliance (HPA) is an amazing and unique charity,
it uses parallels between the stories from books/films/tv-series and our own society to make the world a better place.
Because of this, it appeals to the current generation of young people, as they love these stories and often know them by heart.
Furthermore, they're unique in the fact that they don't have one fixed goal, but rather spread over multiple topics, simply to make the world a better place in any way they can.
Therefore, the HPA isn't so much a charity specialized in a certain type of charitable help, but instead is specialized in the way they approach the situations.
Review from Guidestar