Sasuke might also be angry. Angry at the situation, angry at whoever or whatever caused Naruto's amnesia. His anger could fuel his determination to find a cure. He would push himself and Naruto harder in training, hoping that it would jog Naruto's memory, all while trying to hide his true feelings of worry and fear for Naruto's well - being.
In Naruto amnesia fanfiction, the theme of redemption can be seen sometimes. Maybe Naruto did something in the past that he now doesn't remember, and his amnesia gives him a chance to start anew and make up for it. Another common theme is the exploration of the past. His friends might dig into Naruto's past to help him remember, which uncovers secrets and forgotten events.
I like 'A New Start: Naruto's Amnesia'. Here, Naruto wakes up with no memory of his past, not even knowing he is a ninja. It follows his journey of rediscovery, from learning basic ninja skills again to gradually uncovering his true identity. It has some great character development.
A crossover where a Fairy Tail mage ends up in the Naruto world with amnesia. The ninja initially suspect the mage is an enemy, but as they start to understand the mage's situation, they try to help. In the process, the mage discovers new types of magic by interacting with the chakra - based techniques in Naruto, and this new knowledge could potentially change the way magic works in their own Fairy Tail world once they return.
One common theme is identity. When Harry has amnesia, he has to rediscover who he is. Another theme is friendship. His friends play a crucial role in trying to bring his memories back. For example, they might use the Pensieve to show him his past experiences.
One possible plot development could be that Sasuke tries to help Naruto regain his memories. He might take Naruto to all the places that hold significance in their relationship, like the Valley of the End. Another could be that Naruto's amnesia causes him to forget his ninja skills, so he has to relearn everything from basic training, which would be an interesting journey to follow.
One interesting plot could be that Naruto forgets all his ninja skills. His friends then have to reteach him everything from the basics. For example, Sasuke might take on the role of a strict teacher, which would be a big change in their relationship.
The villagers' attitude towards Naruto could also shift. Some who were always in awe of him might now pity him. But others, like the kids he used to play with, would try to make him remember the good old days. His relationship with the tailed beasts would be really interesting. If he forgets about them, they might try to communicate with him in his mind, which could be a very strange and new experience for Naruto, and it would also be a chance to explore the bond between them in a different way.
The story of Ma Zhaodi's amnesia on the God-Sealing Heroes List was a storyline in a web novel. In this novel, Ma Zhaodi was a mysterious character whose identity and background were always unclear. Later, he lost his memory in an accident, but as time passed, he gradually recovered his memory and became a hero again. There are many other important characters in this story, including other heroes and villains. Their fates also change with the development of the story.
Hinata would also play a major role. Since she has deep feelings for Naruto, she would be devastated by his amnesia. She might try to use their shared memories, like the time she confessed her love to him during the Pain attack, to jog his memory. And the Akatsuki members could also be involved in some cases. If Naruto's amnesia was caused by their actions, they might be the antagonists in the fanfiction, or they could also be trying to use his amnesia for their own purposes.