Deleted the Imaginary Friend

I always put them in a spare crib in a room with no doors, like either in the attic or a basement with no stairs to it, way down the back of the property. Sometimes it pops back into the kid's inventory. I just put it back in it's jail. I have noticed an imaginary friend of some other sim's in the list of sims that come up when choosing force kill or total annihilation in MC. It might have been at university. So maybe if you let it grow up then you can get rid of it in MC just like a pesky townie.