Well, in fanfiction when Saitama gets drunk, he may interact with other characters in a different way. For example, he could become more talkative and engage in long conversations with villains or heroes alike. This could lead to some unexpected alliances or rivalries. Also, his physical abilities might be affected in strange ways. Maybe he would still be strong but lack the precision he usually has, resulting in some clumsy but still powerful actions.
To write a character - driven story about Saitama, focus on his boredom. Show how his extreme power has made his life lackluster. For example, you could write about his attempts to find a hobby that actually challenges him. Maybe he tries painting, but he's so good at it immediately that he gets bored. This exploration of his search for something to fill the void in his life can be a great character - driven story.
One idea could be Saitama facing an enemy that can copy his strength but not his speed. This would create a unique dynamic as Saitama has to use his wits more than just his punch. Another plot could involve Saitama traveling to a different dimension where his power is nullified and he has to start from scratch to regain his strength. And perhaps a plot where Saitama has to train a new hero who is having trouble controlling their own power, similar to how he was once a regular person trying to become strong.
The change in Naruto's character. Usually, he's the go - lucky and sometimes clumsy ninja. But in these fanfics, when he gets serious, it's like seeing a whole new side of him. It makes the story more exciting as he approaches problems in a different way.
A third theme could be facing greater challenges. In these fanfictions, the challenges are so big that Luffy can't just rely on his normal, laid - back self. He has to be more serious to overcome them.
One great 'Harry gets serious' fanfiction is 'The Serious Side of Harry' on FanFiction.net. It shows Harry dealing with the weight of the prophecy in a very mature way.
A third theme could be self - discovery. As Natsu gets serious, he may also discover new aspects of himself. Maybe he realizes he has more power within him than he thought, or he discovers a different way of thinking about his role as a dragon slayer. This can lead to some interesting character arcs in the fanfiction.
The only man who could accept Saitama's serious punches and not die was Luo Ren. If you like this type of novel, I recommend you the following: One Punch: Supermarket Selling Man, One Punch: 50/50, One Punch: Superman Revealer. I hope you like my recommendation. Muah ~
Well, 'Serious Naruto: A New Era' is another good one. In it, Naruto is dealing with the aftermath of a great war and has to be serious in rebuilding the village. The story shows how he overcomes various challenges and grows not just as a ninja, but as a person. It also has some great action scenes that highlight his new - found seriousness.