And it has a sinister part in that it's watching you and telling Santa if you are bold.
Never did elf on the shelf, but as a child I had 3 soft toys (bear, xmas mouse, reindeer) who would appear on my bed 1st december carrying my santa sack. They didn't get moved around every night, they were just my xmas toys to play with, but they were 'spies' from santa to see if I was good too.
I really don't recall finding it sinister. I loved them. They made it feel like xmas. I have passed them down to my own daughter and added a few extra to the clan...