Hero should connect to audience. They should be able to imagine themselves in situation like the hero. People like to see themselves larger than life but they only imagine problems that are related to their normal life.
So, whom can you connect most with? Superman or Batman? Superman does not face problem that we face. Batman and Spider Man seem like human and have best connect.
So, why Batman? Because what power we think we actually want? Batman has best superpowers too. He learnt from the pain of loosing (his parents). He never breaks. That is his superpower. We can connect with this. We can imagine on having it and also want to have it. His greatest foe Joker only wants to break him from inside and not kill him. Tenacity is what makes Batman. And that superpower you can have.
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