Okay Superhero? I'll have to get back to you on that, but I will give you an Anti-Hero and Super Villain.
Jackie Estacado AKA The Darkness
My knowledge of the Comics is limited right now, since I've only started to read them a few months back. I like because of his power mainly, because who wouldn't want to have the power of an ancient soul that is an "elemental force of Chaos and Creation that bestows his hosts with nearly limitless Demonic power as well as allows them acces to an otherworldly dimension and control over the veritable legion of Darklings who dwell there." I know I would .
Possibly my favourite Marvel villain, I like him for many villains his power, the fact that he slapped the Incredible Hulk the once is awesome.