‘Fantastic Beasts’ Actress Claudia Kim Speaks About Playing Nagini

The final trailer for The Crimes of Grindelwald just revealed a major character from the Harry Potter books is part of the new Fantastic Beasts film.

Until Wednesday, Warner Brothers hadn’t disclosed who South Korean actress Claudia Kim was playing. Now, we know Kim plays Nagini, a circus performer with unique powers who becomes Lord Voldemort’s killer serpent and a Horcrux in the main Harry Potter films.

In the new film, Nagini is a member of the traveling Circus Arcanus, using her powers to put on a transformation act for muggles.

Kim says she’s kept her role secret for more than a year and that Nagini is far from the villain she’s thought to be after killing Severus Snape.

“It will be so interesting to see another side of Nagini,” Kim told EW. “You’ve only seen her as a Horcrux. In this, she’s a wonderful and vulnerable woman who wants to live. She wants to stay a human being and I think that’s a wonderful contrast to the character.”

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She also said that during the movie, set in 1927, Nagini can transform from human to snake at will, but one day, due to her blood curse, she’ll become a snake permanently.

“She does feel sometimes it’s not controllable,” Kim said. “She is bound to permanently transform at some point to a beast so she feels this pressure that the clock is ticking.”

In the movie, Nagini will befriend another outcast with transformation issues, the fugitive Credence Barebone, played by Ezra Miller. Barebone ran off and joined the circus after causing havoc in Manhattan during the first film.

“Sometimes I introduce myself as ‘Credence’s only friend,’” Kim said. “It’s amazing these two broken souls are able to form some kind of friendship within the circus. Credence is special to her because he encourages her to use her power.”

Fans are unsure how these two will factor into a war against Gellert Grindelwald. The movie, directed by David Yates, comes out Nov. 16.