Another possibility is that Naruto gets beat up in a fanfiction where the story takes place in an alternate universe. Maybe in this universe, Naruto didn't have the proper training from Jiraiya, and he's not as strong as he is in the original story. So, when facing opponents he could normally handle in the main series, he gets beaten up.
In some fanfictions, Naruto might get beat up when facing a powerful new villain who has some unknown jutsu. This could be a villain created by the fanfic writer to test Naruto's limits.
Another scenario could be a misunderstanding within the guild. Maybe a new member misinterprets Lucy's actions as a threat and attacks her. In the heat of the moment, before the situation is clarified, Lucy gets beat up. This could lead to a story arc about resolving misunderstandings and building trust within the guild.
Sasuke could be one. Given their complex relationship, there could be a situation where Sasuke's newfound power or different ideology leads him to fight and beat Naruto in a fan - made story.
One scenario could be when Naruto finds out that someone has been spreading false rumors about his friends. This would surely make him pissed as he values his friends deeply.
One possibility is that there's a misunderstanding between Naruto and Karui. Maybe Karui thinks Naruto has something to do with Sasuke's actions that have affected her village. So, in her anger, she attacks Naruto.
In 'naruto gets angry fanfiction', one possible scenario could be that Naruto gets angry when he discovers someone has been mistreating his friends in the village. He might immediately confront the wrongdoer with his signature rasengan at the ready.
Well, in 'naruto gets stabbed fanfiction', it could be that Naruto is exploring a new and dangerous area where he encounters a powerful and hostile ninja. In the heat of the fight, this ninja manages to land a stabbing blow. It might also be that Naruto is weakened due to some prior injury or chakra depletion, making him more vulnerable to being stabbed by a regular enemy. And, there could be a situation where Naruto is under the influence of some sort of genjutsu that impairs his ability to defend himself and thus gets stabbed.
Well, in some fanfictions of this kind, Naruto could be tortured physically by being chained up and beaten. His captors might also starve him or deprive him of water to weaken him. It could also be that they use some sort of dark magic or forbidden techniques on him that cause extreme pain and discomfort.
In a 'naruto gets bullied fanfiction', perhaps Naruto is bullied by the children of the more respected ninja clans. They could use their family's status to intimidate him and make him feel inferior. They might also spread false rumors about him, which further isolates Naruto from the rest of the village.
In 'naruto gets wishes fanfiction', one interesting scenario could be Naruto wishing for all his friends who died in the original story to be alive again. This would completely change the dynamics of the Naruto world, as characters like Jiraiya could be around to guide Naruto further. Another scenario might be Naruto wishing for an end to all the hatred in the shinobi world, leading to a new era of peace without the need for constant fighting.
Another scenario could be in a mission gone wrong. The fanfiction might depict a mission where Naruto and his team are caught off - guard by an ambush. There could be a large number of well - coordinated enemies, and Naruto might end up being the main target, getting severely injured as he tries to fight them off and protect his team.