There are several possible motivations. Firstly, he could be inspired by the selflessness of medical ninjas he's encountered. He might want to contribute in a similar way. Secondly, he may have a personal experience, like almost losing a dear friend due to lack of proper medical treatment. This could drive him to learn medical jutsu so that he can prevent such tragedies in the future. Also, it could be a way to gain more respect within the ninja community, as medical ninjas are highly regarded.
In a fanfic, Naruto might be motivated to learn medical jutsu because he realizes that his strength alone isn't always enough. He's been in situations where he couldn't protect everyone, and medical jutsu would be another way to ensure their safety. Also, he may want to prove himself in a different area. He's known for his combat skills, but learning medical jutsu would show his growth and ability to adapt.
He could potentially learn the Flying Thunder God Technique. It's a very powerful jutsu that Minato was famous for. Naruto's already fast with his Sage Mode and Nine - Tails Chakra, and this would make him even more formidable in battle.
Perhaps the Hokage has made a decision that Naruto believes will destroy the village's future. Like if the Hokage decides to sacrifice a large number of innocent villagers in order to achieve a short - term goal. Naruto, with his strong sense of justice, might see killing the Hokage as the only way to stop this madness.
Another jutsu they might learn is the Summoning Jutsu. Naruto has a strong connection with the toads. He could teach the genin how to form the necessary hand seals and make a contract with a suitable summon. This would give the genin an extra edge in battles, being able to call upon a powerful ally.
It could be a new form of Rasengan. Maybe Naruto discovers a way to combine different elements with the Rasengan more effectively, like adding lightning to it for a more powerful and faster attack.
In a fanfic where Naruto learns medical jutsu, it could greatly impact the story. Firstly, it would make him more versatile in battles. He could heal his comrades on the spot, increasing their chances of survival. This would also change his relationships. For example, he might become closer to Sakura as they now share a common area of expertise. Moreover, it could lead to new plotlines. He might be sent on special medical missions or be able to develop unique jutsu combinations that incorporate his medical skills.
Well, Naruto could use the Smoke Jutsu to create illusions within the smoke. He might make it seem like there are a hundred Narutos emerging from the smoke, scaring his enemies. This would be a creative use of the basic Smoke Jutsu, adding an element of deception.
He might learn Orochimaru's signature snake - related jutsu, like the Hidden Shadow Snake Hands. This jutsu allows the user to summon snakes from their sleeves or other hiding places to attack opponents.
He might learn a time - traveling jutsu. This would be really cool as it could allow him to go back and change certain events in the Naruto world, or gain knowledge from the past to use in the present battles.
One common motivation is the pursuit of power. In Naruto fanfic, characters might be driven to become stronger to protect their village, like Naruto himself. Another motivation could be revenge. For example, a character whose family was killed by a certain villain in the Naruto universe might be motivated by revenge in the fanfic. Also, love can be a strong motivation. A character could be motivated to achieve great things to win the heart of their beloved.
Well, in certain fanfic scenarios, Naruto could learn paper jutsu as a result of some experimental training. For example, he might be trying to combine different elements of his existing jutsu and accidentally discovers a way to manipulate paper. It could be that his chakra takes on a new form during a particularly intense training session and he realizes he can control paper with it.