Let's start with the most obvious one, shall we? It's confirmed early on in the film that Nagini (Claudia Kim) is indeed the same snake Voldemort favours decades later, but when we meet her in Crimes of Grindelwald, she's far from evil. In fact, she's rather sweet. She seems to be the only one who can keep Credence (Ezra Miller) grounded, and loyally helps him in the search for his mother. However, it's not hard to see how she might develop a malevolent streak later on in life — before Credence helps her escape, she's held prisoner in a demeaning circus for "freaks," and forced to perform her unique ability to transform into a massive, writhing snake on command as crowds of people jeer.