If Harry becomes a Naruto fanfic, he might start trying out Naruto - style ninja techniques in the wizarding world. For example, he could attempt to use chakra - like magic to enhance his spellcasting speed or power. It would be a really interesting crossover concept.
If Harry were to become part of a Naruto fanfic, he would be exposed to a whole new set of values and skills. The idea of the ninja way, which emphasizes things like perseverance and loyalty, could have a profound impact on him. He may start to view his battles against Voldemort in a different light, perhaps seeing them as more of a test of his own ninja - like resolve. Also, he could get really into the different jutsus in Naruto and might even try to find magical equivalents in the wizarding world. For instance, the Sharingan's ability to copy techniques could inspire him to look for ways to quickly learn and replicate new spells.