In many Naruto fanfictions, characters like Madara Uchiha are often considered extremely strong. His Sharingan abilities, especially the Eternal Mangekyo Sharingan, give him incredible power over illusions and combat skills.
In such a fanfiction, Naruto could be inspired by Iron Man's intelligence and innovation. He might start to study more about mechanics and engineering in addition to his ninja training. This could lead to the creation of new weapons or tools in the ninja world. He could also take Iron Man's concept of a self - sufficient suit and apply it to his ninja way. For instance, creating a suit - like armor that can protect him from various attacks and also has its own built - in jutsu - like functions.
Intelligence and strategic thinking are crucial too. A character who can outwit their opponents, predict their moves, and come up with clever battle plans is more likely to be considered the strongest. In fanfiction, a character might be written to have a genius - level intellect, allowing them to defeat stronger opponents through their wits rather than just brute force.
One possible plot could be that Naruto, as the only man left in the world, has to face the challenges of a society dominated by women. He might have to prove his worth in a completely different social structure, perhaps by using his ninja skills in new ways, like protecting the female - led communities from threats they can't handle on their own.
I'm not sure exactly who the character is without more details about the specific story. There could be many interpretations of who the 'happiest man in the world' might be in different stories.
In the 'greatest man in the world story', the greatest man might be the one who shows the most courage. He could be facing great challenges and still be able to inspire others around him. For example, if there is a war in the story, the man who stands up for justice and fights bravely against the oppressors could be considered the greatest. He doesn't just think about himself but also about the future of his people and the world he lives in.
I'm not sure as I haven't read the specific story. But generally, in such a story, the happiest man could be someone who has achieved his long - desired dreams, like finding true love or fulfilling a great ambition.
The plot could start with Naruto suddenly realizing he is the only man. Then he might go on a journey to find out what happened to the other men. Along the way, he meets different groups of women, some friendly and some hostile.
Perhaps in this fanfiction, Naruto is the only man left with chakra. This would make him a target for those who want to control or use his power, leading to intense battles and power struggles.
It could be a group of radical female ninjas who see Naruto as a threat to their new - found power structure. They may want to get rid of him to ensure that the world remains under their complete control.