Not all is "Fantastic" in Potter world after the newest trailer for "Fantastic Beasts: The Crimes of Grindelwald" dropped this week.

The casting of South Korean actress Claudia Kim as Nagini, who transforms into the snake in the final trailer for the film out in November, doesn't have everyone under its spell. Nagini eventually becomes Lord Voldemort's menacing snake.

Some on Twitter were quick to point out, what they felt, was inappropriate about the decision. 

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