Who needs Polyjuice Potion? Kari Lewis certainly doesn’t. The cosplayer recently went viral because of her striking resemblance to Harry Potter star Emma Watson. That’s right, the internet has discovered another Hermione Granger. Potterheads rejoice! Instagram pictures of Kari looking uncannily like Hermione and Belle have been circulating the net. Check out Kari’s cosplays below. They’ll definitely have you asking …