There were no dogs and kids in the Batman series I grew up with, just Batman, Robin and super villains.
My favorite then was The Joker, later of course Cat Woman, preferably played by Julie Newmar (look to the left, that's Julie too)
Cat Woman is still a favorite, but I don't like the Joker anymore. Too ... I-don't-know-what, just too. Today I would go for The Pinguin as the real menacing lunatic. Mean, lean and keen.