TOD
Superman, sometime around 1962. I was late to the game, even then, but quickly found that I loved that family of characters and comics. I dabbled in Batman for a bit, but the Superman universe was mine. Sadly, that pile of comic books eventually vanished.
In my adult life I much enjoyed the initial round of Superman and Batman films, but I haven't the energy or interest to explore any of the later ones, and I never had an interest in any superheroes beyond those two.