Some of my childhood heroes would be Asterix and Obelix and I still like them. Sure, they're not all bad ass mofo's but they are hilarious.
I also find Rahan to be an interesting hero, driven by curiosity and using his brain rather than brute force, truly a civilizing hero.
As for villains, I never actually found a villain that suited my taste, except for The Master. I liked the fact that The Master had a good back story, he felt real, he had a purpose and he wasn't black and white but mostly Gray...