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series presents very Jewish values and has been endorsed by such rabbinic leaders as Rabbi Chaim Pollock, Rosh Machal of the Linda Pinsky School for Overseas Students at Michlalah University for Women in Jerusalem (of which my daughter is an alumna and personally heard Rav Pollock speak on this topic).
On a very simple level, Orthodox Jews can find many similarities between J.K. Rowling's wizarding world. Not only do we have a unique culture, although often blending in with the muggle/non-Jewish world, we have our own laws and schools. We even have our own shopping districts -- in Cedarhurst its Central Avenue; in Teaneck its Cedar Lane; in the wizarding world its Diagon Alley. We even have our own unique "uniforms" that identify us to each other, even though those not in our culture may have no idea of what or who we are.
One of the central themes of the Harry Potter books, is, as Prof. Dumbledore says in Chamber of Secrets, "its our choices that define who we are, not our abilities." This is very similar to Judaism's defining verse about free will and righteousness: "...I have set before you life and death, the blessing and the curse; therefore choose life, that you may live, you and your heirs." (Deut. 30:19).