Not sure if you still need an answer but my favorite character is Remy. He is: Brave, talented, and focused. Since the movie's main character is a rat that can talk, I would say that it is fictional and humorous. A family comedy.
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Trial and error mainly, but I would at least change the settings for night time and maybe change the white balance to make it look normal (so it isn't yellow or blue). It's mainly up to the person to decide what is correct for the exposure time and color balance.
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Hope this helps!