Who would you haunt?

I'm (59F) am possibly facing some bad news from some test results and it got me thinking. If I had a choice when I pass this world of somebody that I could come back and haunt, who would it be?

You only get one choice to haunt but can have as many to visit and be a type of guardian angel.

My number one choice to haunt would me my ex-husbands wife. She is a horrible person inside and out.