Often, there's the theme of Naruto using his ninja skills for good in the hospital. For example, his ability to sense danger could help in predicting a patient's sudden decline. And his strong willpower could be an inspiration for patients to fight their illnesses. Another theme could be the relationships he forms with the other hospital employees, some might be initially skeptical of him but later come to respect his abilities.
There are many 'naruto runs an hospital' fanfictions out there. One way to find them is to check on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just search for the specific keyword 'naruto runs an hospital' and you'll get a list of relevant stories.
Well, in some fanfiction, Naruto could be in the hospital because of a new and strange illness that no one has seen before. The story could focus on the doctors in the ninja world trying to figure out a cure. And Naruto being Naruto, he might be cracking jokes with the nurses and other patients, spreading his positive energy even while sick.
It's possible that there's a strange illness going around the village and Naruto goes to the hospital to see if he can offer any help. He has a strong sense of justice and would want to do whatever he can to stop the spread of the illness and make sure everyone gets better.
In this fanfiction, Naruto could also face challenges in running the clinic. He might struggle with administrative tasks since he's used to the action - packed ninja life. But he could hire some of his ninja friends to help, like Sakura as a medical expert and Rock Lee to handle the physical tasks around the clinic.
In a 'naruto runs a shop' fanfiction, he could run a pet shop. Naruto has always had a connection with animals. He rescues and rehabilitates injured animals and then finds them new homes through his shop. He might also have some special ninja - animal hybrids in his shop that are a big draw for customers.
He could meet some of Iwa's powerful ninjas. Maybe Onoki, who could either see him as a threat or an opportunity. There might also be some young Iwa ninjas who are curious about Naruto and his abilities.
He might meet some of his distant Uzumaki relatives. There could be elders or other Uzumaki clan members who have valuable knowledge about his family and their special abilities.