Well, I've got a few I like:

-Batman, just for all the cool gadgets he's got to make him into a superhero.
-The Punisher, for the cold demeanor and awesome weaponry.
-The Flaming Carrot, for being a working-class superhero! UT!

My favorite is Hong Kong Fooey

Captain CaveMan, and Smoo. are a close second.

Danger Cat with Minute Mouse and Underdog were my favorites when I was little.

Monty :-/

The Powerpuff Girls!

Oh, and NEMESISTER!!! :D :D :D

I forgot to mention Popeye. He's a superhero, right? ;) And Inspector Gadget.

The Powerpuffs were ace and Wattoo Wattoo never used violence but I'd have to go for Rorschach from The Watchmen. His super-power was insanity.

Batman.

Inpsector Gadget yes, Popeye.....ehh I'm not too sure about that.

Penny and Brain Rock....

I always prefered the Black and White Popey over the Color episodes.
I just liked that old BW animaiton better, same goes for Mitghty Mouse.

Monty :-/

I started to become a big Captain America fan around the time Spawn was becoming all the rage. I like the idea of Superman, an inconqaurable piller of good and justice, but I could never get into him.
Captain America is more my style. He's not the most amazing hero powers wise, but he, like Superman, is a symbol of all that is good. But I really like how his origens are from WWII. I'm a big history buff and Captain America fits right into that love of history, both ficional an real.
The Tick is another great superhero for the list but another all time fave hero of mine is Optimus Prime!

The Crimson Chin.