Wolverine

Unlike most superheroes, Wolverine is feared by most of the humans who he protects. He is basically a hero with extremely powerful and natural steroids. His body heals itself extremely quickly. Also, he has a skeleton with three claws on each hand that was fused with an unbreakable metal called adamantium. He is one of the few heroes who is practically invincible. There is no way to penetrate the metal that runs throughout  his body, and his body heals itself so fast that he practically can't get hurt. The strange thing is that he still feels pain. Batman is the same as Wolverine in this way. The thing about Batman is that he is still human. He accomplished amazing things without the help of extreme regeneration, and he is capable of ending crime without ending a life. Wolverine is a stubborn killer who could probably live forever. Batman is a hero who has to face his own mortality. He ages and continuously decides to risk his life to help the lives of those around him. For Wolverine there is no risk involved except for the risk of pain.