Spirited Away was the first Ghibli movie I've ever watched when I was a kid. :) And I have to agree... perhaps, I didn't care much about the "funny-looking monsters" back then, but I'm able to appreciate the film more after watching it as an adult. :)

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If you're interested in yokai, I recommend you watch the "Mononoke series". There was a new Mononoke movie released on Netflix last year, too. ^^ The art style is similar to ukiyo-e which is one of its interesting points. :D