How about a hero who is a time - traveler? They go back in time to prevent a great war from starting. Along the way, they face many challenges like trying to fit into different historical periods, dealing with the people who want to start the war, and also struggling with the moral implications of changing history. It could be a story full of adventure, mystery, and moral dilemmas.
A hero story could be about a regular person who finds an ancient artifact that gives them the knowledge to fight against an evil corporation that is exploiting the poor. They use this new - found wisdom to expose the company's wrongdoings and free the oppressed. This hero doesn't have superpowers in the traditional sense but uses intelligence and courage.
One idea could be a hero who discovers they have a special power that can save their city from an environmental disaster. For example, the ability to control plants and use them to purify the polluted air and water.