A Phoenix will gain human form but lives and dies like a Phoenix bird they will eventually find a mate who is always a Phoenix that's gained human form but sometimes they are creatures as humans Hermione gained a human form and was found by Rowena Ravenclaw, adopted as her second child she's lived many life times alone since the founders all died out and left Believed to be Rowena's only living heir and very great granddaughter she finally decides to return to Hogwarts for school instead of Beauxbatons Academy finding corruption and favoritism by the Headmaster