Problems faced in mashup

At the begining when I planning my mashup, I chose around 10 movies for my mashup which are
paranormal activity 3, insidious, silent hill, poltergiest, one missed call, sinister, a nightmare on elm street, the sixth sense, the woman in black and house at the end of the street.

I watched some of the mashup videos which they threw in lot of scenes from different places, different episodes from same series and etc. Therefore I thought what I have to do is just to throw in horror and birthday scenes.

Mister Rogers Remixed | Garden of Your Mind | PBS Digital Studios

One of the mashup video I watched is mister rogers remixed.

However, when I work more on this assignment I found out things aren't that easy like what I thought.

I have to actually fix 1 or 2 characters as the main character just like what movie, drama or film did. 

So slowly I have a question in my mind which Im wondering do I have to make one main character or I just have to make a random horor mashup video. Just simply combine scenes which I think is scary.

Then after trying out and watching other videos for some time, I finally decided to fix 1 or 2 main characters which they will appear more throughout the mashup.

Reference

Studios, D., P., (2012). Youtube. Mister Rogers Remixed | Garden of Your Mind | PBS Digital Studios.
<Available at : http://www.youtube.com/watch?v=OFzXaFbxDcM>