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I was on deviantart looking at superhero/ super villain art when something occurred to me. If the Joker and Harley Quinn did managed to have a kid without blowing it up as a humorous joke, it may end up to quite humorless character very forward and direct… maybe like Discworld's  A.E. Pessimal personality wise. It just pop in my head because most of the time, the fictional kid is merely a little clown which is quite logical. However kids rebel. Hippies rebel against the values of their straight laced parents. Yuppies were all about the money much to the dismay of their hippie parents. I could see it somewhat. Harley Quinn and the Joker in their bright outifits looking at someone with a brown boring suit and plain little hair do. However being the child with parents so crazy, that person would be extra scary when something made them lose control. I manage that it would be all about control with a kid.