Perhaps it's a scientist. A scientist would be an interesting choice as the main character. He could have some knowledge about what happened to the world and might be using his skills to try and find a solution or at least understand the situation better. He could be studying the environment, looking for any signs of what caused the downfall of humanity.
The main character could be a survivalist. This type of person would be well - equipped to handle the situation. He'd know how to hunt, build shelters, and find water. He might have been preparing for an apocalypse all his life, and now that he's the last man, he's using his skills to stay alive and maybe even trying to figure out a way to repopulate the earth.
It could be an ordinary guy. Just an average Joe who happened to be the one left. Maybe he was a simple office worker before the world changed.
It could be an ordinary guy. Just an average person who happened to survive whatever catastrophe wiped out the rest of humanity.
It could be a young and brave girl, maybe a teenager who has been through a lot already in her life.
It could be a regular person, like a construction worker. They are used to dealing with tough situations and using their hands to fix things. In the 'last human on earth' scenario, they could use their skills to build a safe haven for themselves, fortify buildings against threats, and find creative ways to get resources. For example, they might know how to set up a water - collecting system from the rain.
Another possibility is that Naruto himself could be his own antagonist in a sense. His loneliness and the weight of being the last man on earth could drive him to the brink of madness. He might have to fight his own inner demons, which could be manifested as a dark version of himself that wants to give up on the world and just let it decay.
I think Batman has a good chance. He's a master strategist and is used to working alone. He has a wide array of gadgets and his detective skills would be very useful in a post - apocalyptic world. He could also use his knowledge of Gotham's underworld to survive.
There could be a non - human villain like a powerful and corrupted magical creature. It might have been awakened by the chaos in the wizarding world and decided to wipe out all the wizards except Harry, seeing him as a worthy opponent or a key to some greater power it desires.
I'm not sure as the story isn't fully described here, but it's likely to be the man who is considered the happiest on earth.
The main character is surely the last man standing. However, depending on how the stories are written, there could be some other 'phantom' characters. For example, the voices he hears in his head which could be remnants of people he once knew. These might not be real characters in the present but play important roles in his mental state.
The story of the last man on Earth usually described him as a lonely existence living in an extinct civilization on Earth. He could be a scientist, an astronaut, an explorer, or someone in other fields related to Earth's civilization. After the extinction of this civilization, he was the only one left on Earth. He faced many difficulties and challenges in finding food, water, and items needed to survive. He may also experience many moments of pain, loneliness, and despair because he has no one else to communicate with and help him. However, he might also discover some unexpected secrets and opportunities. He might discover relics and relics on Earth and learn about the history and development of this civilization. He might also find some precious resources such as rare metals or precious cultural relics to change his living conditions. In short, the story of the last man on Earth could be a very colorful story full of challenges and opportunities.
I'm not certain without more context. There could be many different authors who might have written a short story with this name.