Daredevil, or Matt Murdock, is someone who was dragged into fighting a war when he was just a child. Blinded in an accident that heightened his other senses, he uses his powers both in his red suit and in a smart suit, fighting as a lawyer by day and taking on the lawless by night.
The Doctor, the man of many faces. The Doctor travels through time and often ends up in the middle of trouble, helping people and planets wherever he ends up. The Doctor has become the stuff of legend both in his world and ours, being around for over 50 years.
Luke Skywalker, from Star Wars, is a good example of a hero. He was a normal farm boy who dreamed of adventure and took up arms against the Empire when he could of just walked away.
Batman, or Bruce Wayne, is a rather iconic hero. Although his story is rather strange in my opinion. His parents are killed right in front of him so when he grows up he uses the money he was left with to make gadgets to fight crime. Despite the good he has done, the way he goes about doing it makes it easy to see why some people see him as another but a hero. However, his courage and intellect have ended up saving a lot of people.
Here's one for you. People. Humans. The worst kind of villain and the best sort of hero. The human race as a collective is a bunch of good or bad. However, no one is actually good or bad. Sure, everyone can do good or bad things. But just because someone kills 100 people to save 10,000, does that make them bad? If a crime lord makes millions by selling drugs then donates a lot of money to the poor, does that make them good? It all depends on your point of view. All anyone has to do is think.
Iron Man, or Tony Stark, is a good example of a guy trying to do the right thing. After seeing what his weapons company was doing to normal people and where his tech was ending up, he used his skills to create the Iron Man suit to fight for a better cause. He isn't perfect, but he always tries to do the right thing.