Like @mellowwheat said, the main character is a “half-blood” and the chosen one; one of the friends is “muggle-born” yet one of the most powerful magic users in recent memory; and the other friend is a “full blood” wizard who still kinda sucks.
Even the core three characters are supposed to be allegorical for “racism doesn’t mean shit.” I honestly don’t know how JK went from writing fiction that could be interpreted as pro-trans (at least from the standpoint of the movies), into doubling down on bigotry. I guess it was Twitter after all.