I recall a fanfic where Tsunade as Naruto's grandmother plays a crucial role in his training. It's titled 'Tsunade's Training for Naruto'. In it, she pushes Naruto to his limits in physical and mental training. She helps him understand the importance of chakra control in a new way. This makes Naruto a more well - rounded ninja, and their relationship becomes even stronger as they face challenges together during the training.
There's a fanfic called 'Tsunade's Influence on Naruto'. It focuses on the political aspect. Tsunade, being Naruto's grandmother, uses her influence to help Naruto gain more support within the village. She teaches him how to handle the complex politics of Konoha. The story also shows Naruto's respect for Tsunade growing as he realizes how much she has done for him and the village.
One great fanfic could be 'The Legacy of Tsunade and Naruto'. In this fic, it delves deep into how Tsunade's wisdom as Naruto's grandmother shapes his growth. It shows her teaching him some of her unique medical ninjutsu skills, which Naruto then combines with his own combat style. It also has a lot of heartwarming family moments between them, like when Tsunade tells Naruto stories about his parents that she knew from her own experiences in the village.