In the Harry Potter book series, Peeves is a poltergeist that roams the hallways causing trouble. He never really adds anything essential to the plot line, but his scenes are amusing.
Obviously they had to cut out a lot of details to make the movies, but why did they choose to cut out an entire character?
If they had to do that, why did they choose Peeves over other non-essential characters (e.g. Nearly Headless Nick)?