In fanfiction, Minato's possessiveness might show in his reactions to Naruto's achievements. He could take too much pride in Naruto's success as if it's only his to be proud of. For instance, when Naruto accomplishes something great, Minato might act as if he's the sole reason for Naruto's success and not give enough credit to Naruto's own hard work and the influence of his friends.
He uses his skills as a ninja to protect Naruto. He sets up special seals around Naruto's crib to keep out any potential threats. Also, Minato might try to use his chakra to boost Naruto's weak body. He would transfer his own life force a little bit at a time to help Naruto fight the sickness, which is a huge sign of his love.
Minato might show his protectiveness by always being near Naruto in spirit. For example, he could leave behind some kind of jutsu or power that activates when Naruto is in great danger, like a hidden seal that releases a powerful defense.
In the fanfiction, Naruto could show his genius in leadership, just like Minato. Minato was respected as a leader. Naruto may inspire others around him with his determination and positive attitude. He could come up with innovative plans to protect the village and its people, much like Minato did. Also, Naruto's ability to understand people's feelings and bring them together could be a sign of his genius in this aspect.
She might constantly be around Fleur, not allowing others to get too close. For example, she always intervenes when someone tries to have a private conversation with Fleur.
One way it could manifest is in his training methods. He might be more strict and dedicated with Naruto compared to other students. He could also try to monopolize Naruto's time for training, not wanting other ninjas to interfere with Naruto's growth under his guidance.
Minato's presence can have a huge impact. He can act as a mentor, teaching Naruto things he never knew about his family and heritage. His wisdom and skills can inspire Naruto to reach new heights in his training and ninja development.
Well, Minato might constantly be by Naruto's side in the fanfiction. He could prevent Naruto from taking on any dangerous missions, even if Naruto is capable. For example, he may interfere when Naruto tries to join a risky battle against a powerful enemy, saying it's too dangerous for him.
He could feel it through a shared chakra link. Since they are related and Minato sealed the Nine - Tails in Naruto, there might be a latent connection that gets activated in the fanfiction, allowing him to sense Naruto's pain on a physical and emotional level.
She might be overly protective of Naruto in fanfiction. For example, she could prevent other characters from getting too close to him or interfere when she thinks Naruto is in a potentially harmful situation.
Naruto, like Minato, might show prodigious skills in areas such as combat and strategic thinking. Minato was known for his speed and his ability to quickly analyze situations. Naruto could be depicted as having similar traits, perhaps with his own unique spin. For example, Naruto might have an uncanny ability to learn new jutsu quickly, just as Minato was able to master complex techniques at a young age.