They are not scary. Not at all. For comparison.....
Not insulting anybody's kids..... my nephew is 10, ridiculously sheltered and commercials for video games like Halo or Call of Duty can give him nightmares. He is only allowed to watch cartoons and Little House on the Prairie for the most part. He is scared of the Hulk in the Avengers, the Jurassic Park movies, the Beast from the commercials of the live action movie, most Disney villains in cartoon form, and the list goes on. He absolutely loves Sci-Fi Dine-In and intentionally eats very slow so he can see every clip before time to leave.