I gotta go with the Flash -- the one in the red suit from this earth, not the earth II guy with the weird hat. He was the best! He could shimmy shake and bake so fast he could just vibrate himself into other dimensions and worlds, no wormhole needed ... could run around the world seven times in less than one second, near the speed of light. Kept his super red suit in his ring! Gotta love how his girlfriend was always complaining that Barry Allen (his alter ego) was too slow ... I really dug the Green Lantern too, and the Green Hornet and Kato were kinda cool. The dude from Mars, Green Jonno' Jonzz or something like that, was as powerful as Superman, but his Achilles heel was FIRE, a much bigger problem than kryptonite. The Atom had a great thing going with getting to be so, so small ... From the Marvel family, other than Spidey, I really liked Elastic Lad, Johnny Flame, and the Invisible Girl.
Anyone remember the old TV show the Immortal, the guy with blood that gave him eternal life, but he was hunted like an animal by the sick old terminally ill billionaire in a wheelchair?