A fanfic with Naruto and Escanor's power would likely explore how Naruto adapts to such a different kind of power. Escanor's power is closely tied to the time of day and his emotions. Naruto, on the other hand, has his own system of chakra control and ninja skills. The story could show Naruto struggling at first to control this new power. He might accidentally go into an overpowered state during a simple training session. But as he learns to master it, he could use it to protect his village in ways he never thought possible. He could even use it to bring new peace treaties with other villages as they fear his newfound strength.
It could be really exciting. Maybe Naruto gets some of Escanor's power of the sun. He could use it in battles against tough enemies like Madara. For example, he might be able to increase his strength during the day like Escanor does with his 'Sunrise' form, and become almost unbeatable.