I'd like to see the imaginary friend return :o if they can be even creepier that'd be cool! It was such a creepy and neat feature in Sims 3! I was reminded of them when I found this hilarious artic...
I think one of the things that creeped me out the most with the imaginary friend is that if you chose to not make it real for whatever reason, it would AGE UP with the kid. And don't get me started on the walk.