Well, if Tsunade were Naruto's mother in fanfiction, it would likely change the story a great deal. For one, Naruto might have had a more stable upbringing in the village. Tsunade could have protected him from some of the early hardships he faced, like being ostracized for having the Nine - Tails. Also, Naruto might have learned medical ninjutsu much earlier from Tsunade, which could have added a new dimension to his fighting style. And perhaps he would have had a more confident personality from the start, since Tsunade is a strong - willed and confident character herself.
Well, it could make their relationship more complex. Tsunade might be more protective of Sakura, seeing as she's her daughter. She could train Sakura more rigorously and be more involved in her personal growth.
She might be initially shocked. Given her own past traumas and her relationship with Naruto, she could be hesitant at first. But then, considering Naruto's lonely situation, she might warm up to the idea and show a more maternal side towards him.
It can add a new layer of drama. For example, if Tsunade is secretly in love with Naruto, it could create tension between her and other characters who have a close relationship with Naruto. Maybe she becomes jealous in situations where Naruto is close to Sakura or Hinata.
The story dynamics would shift significantly. Naruto would be part of the Senju clan in a more direct way. This could mean he has a different standing in the village. Tsunade might pass on her unique skills and knowledge more readily. He could also have a different role in the political aspect of the village. Maybe he would be more involved in clan meetings and decisions. This new family connection could also influence how he is perceived by the other villages. They might be more cautious or more eager to form alliances with Konoha because of Naruto's relation to Tsunade.
The 'Naruto Kyuubi Mother' concept can change Naruto's story by adding a new source of guidance. Instead of just relying on Jiraiya or Kakashi, he now has this mysterious connection to the Kyuubi's mother which can lead him in different directions.
Well, it could change the plot in many ways. For example, Naruto might be more confident in battles against stronger opponents earlier on. He could use Tsunade's brute strength to overpower enemies that he previously had to outwit. Maybe he wouldn't rely as much on his shadow clones or the Nine - Tails' power in the early stages of fights. This new strength could also make his friends and allies view him differently, perhaps with a bit more awe or even fear at first because they are used to his regular abilities.
At first, their relationship would be very awkward. Naruto would be a bit shy and Tsunade might be stern. But as they get to know each other better, they could become friends. Eventually, they might develop romantic feelings. For example, Naruto could start to admire Tsunade's leadership skills and Tsunade could be impressed by Naruto's growth.
Well, if Naruto was Tsunade's son in the fanfiction, his character might become more confident earlier. Tsunade is a strong and respected figure in the Naruto world. Having her as a mother could mean Naruto has more direct access to powerful jutsu training and political influence. He might not be as much of an underdog as in the original story, which could make his journey to becoming Hokage a bit different. He could also inherit some of Tsunade's gambling habits, which would add an interesting twist to his character.
Well, it could make their relationship more like a real family. Tsunade might become more protective of Naruto. Just like a mother would be towards her son.
The relationship would become extremely complex. Naruto, who respects Tsunade deeply, would be uncomfortable with the power dynamic. He would constantly try to find a balance between respecting her as a person and fulfilling whatever the 'slave' situation entails. Tsunade, on the other hand, would be in a position of having to follow Naruto's commands, which would be a huge shift from her normal authoritative role.