Well, one way could be that his shadow clone jutsu becomes a magical cloning spell. Instead of just creating physical clones, they could have magical properties like being able to cast minor spells on their own.
Perhaps Naruto's ability to sense chakra is changed into a magical sense. He could detect magical auras instead of chakra. His strong willpower, which was important for his ninja growth, could now be the fuel for his magical powers, allowing him to perform more complex and powerful magic spells.
Well, one way could be that his physical ninja skills like running fast and jumping high could be used in a more stealthy way in the Tashio period. For example, he could use his speed to quickly move through the narrow alleys of the Tashio city without being noticed, much like how a thief or a spy might operate. His ability to climb walls could also be useful for getting into places he's not supposed to be. Maybe he could use his shadow clone jutsu in a more discreet way, like creating a clone to distract someone while he sneaks up from behind.
His speed could be used in sports. For example, he'd be great at track and field events. His ability to sense danger could help him in security - related campus jobs.
Perhaps Naruto, being a mechanic in this fanfiction, uses his shadow clone technique in a unique way. He could create clones to work on different parts of a large mechanical project simultaneously. Each clone could have a specific task, like one clone handling the wiring while another works on the engine assembly, similar to how he uses clones in combat to surround and outnumber his opponents.
Maybe Naruto could use math to calculate the trajectory of his shurikens more accurately, like using angles and velocities in math to ensure his attacks hit the target precisely.
His speed from being a ninja would make him a very fast runner on the football field. He could easily outrun opponents to reach the ball first.
Well, Naruto could use his chakra control to enhance Spiderman's web - shooting ability. Maybe he could infuse his chakra into the web fluid to make it stronger or have special properties like being able to cut through certain objects. Also, Naruto's speed and agility as a ninja could be combined with Spiderman's acrobatic skills, making them even more formidable in combat.
Naruto could use his chakra control to enhance his Kryptonian super speed. For instance, he could focus chakra on his legs while using his Kryptonian speed to move even faster and more stealthily. Also, his shadow clone jutsu could be combined with his Kryptonian powers. He could send clones with super strength or heat vision to attack enemies from different directions.
His speed could translate into quickly gathering and processing evidence. Naruto was always quick on his feet during battles, and in the legal world, this could mean he can outpace his opponents in terms of getting the necessary paperwork and facts. For example, he can be the first to interview key witnesses.
His taijutsu might be more refined. Rin, having trained with Kakashi and Obito, could pass on some unique close - combat techniques. Naruto might also have a better understanding of chakra control from an earlier age. Since Rin was good at medical ninjutsu, Naruto could potentially combine that with his own chakra - based attacks in creative ways.
In a military setting, Naruto's ninja skills would have to be adjusted. His ability to sense chakra could potentially be used to detect hidden enemies or traps. His summoning jutsu might be adapted to call upon creatures or resources that could assist the military. However, he would also need to learn military tactics and protocols. He would have to work within a chain of command, which could be a challenge for him at first, considering his independent streak as a ninja. But his strong will and determination would likely help him adapt quickly.