Captain America. He represents the best of us, though not without his faults and weaknesses.
The Flash. Honestly powers are cool and all but he gave me a lot of hope in a time I needed it.
Bananaman from the Dandy. Awesome costume, delicious fruit
Going to have to say Hulk. Supreme strength and his tenacious attitude is so awesome.
Dr. Manhattan. He can control atoms and is without a doubt the most unstoppable comic book character ever. Depends whether or not you seem him as a hero though.