Naruto's fighting style in fanfiction evolves in multiple ways. His physical strength and speed increase over time. He may develop new ways to combine his different powers, such as using his Sage Mode and Nine - Tails chakra simultaneously. His mental growth also plays a role. He becomes more confident and less impulsive in battle, which allows him to plan his attacks more carefully. Additionally, he might be exposed to different fighting cultures or techniques in fan - created stories, which he then adapts into his own style, making it more versatile and unpredictable.