Naruto's Sage Mode would be really useful. He could use it to sense the zombies from a greater distance, and its enhanced physical abilities would make it easier for him to take on zombies. Also, he might develop new jutsus based on the situation. For example, he could create a jutsu that immobilizes zombies in a large area. His ability to communicate with nature in Sage Mode could also help him find safe places or sources of food and water that are hidden from the zombies.
His speed would be even more important. He could quickly move around zombies and avoid being bitten. For example, using his Rasengan, he could blast through groups of zombies easily.
Sonic's speed allows him to be a great scout. He can cover large areas in no time to find safe places or look for resources. His ability to spin dash can also be used as an offensive move against zombies. Tails, on the other hand, could use his two tails to fly and get a better view of the surroundings. He could also use his knowledge of mechanics to jury - rig weapons from the debris around. For instance, he might make a makeshift flamethrower using some old parts and a fuel source, which would be very effective against zombies.
The ninja in the Naruto world are used to combat and danger. In a zombie apocalypse, characters like Kakashi could use his intelligence and wide range of jutsu. He might use his Earth - Style: Earth Wall to create barriers against the zombies. As for Hinata, her Byakugan could be used to see zombies from afar, giving the group early warning. And the teamwork among them, which is a staple in the Naruto series, would be their greatest strength in this new and terrifying situation.
His water - based jutsu might improve. Since Kiri is known for its water ninjutsu, Naruto could learn new techniques or modify his existing ones. For example, he could combine his Rasengan with water chakra to create a more powerful and water - enhanced attack.
Well, Naruto's speed and agility could help him avoid the dinosaurs easily. His shadow clone jutsu would be really useful. He could send clones to distract the dinosaurs while he figures out a plan to either escape or deal with the situation. Also, his rasengan might be able to stun a dinosaur if he uses it right.
Naruto's shadow clone jutsu would be extremely useful. He could send out clones to scout for zombies or to lead them away from the high school. His Rasengan could be a powerful weapon against groups of zombies, blowing them apart. And his enhanced strength and speed due to his ninja training would allow him to easily evade and fight the slow - moving zombies.
One idea could be Naruto using his shadow clones to distract the zombies while he and his team find a safe place. Maybe he discovers a new jutsu that can control the zombies instead of just defeating them.
Naruto's jutsu would have interesting adaptations. His Rasengan could be turned into a super - attack in the SAO world, perhaps with added effects like stunning enemies for a short time. His chakra control could be related to his mana management in the game. So, he would need to be careful not to overuse his 'chakra - like mana' and run out during battles.
A possible plot could be that an unknown enemy uses a powerful jutsu that accidentally creates zombies. The story could start with Naruto and his friends in Konoha noticing strange behavior among some villagers. As the situation worsens, they realize it's a zombie outbreak. They then have to band together, find out the source of the outbreak, and try to stop it while also protecting the remaining survivors.
His ninjutsu might be enhanced. For example, his Rasengan could gain new properties due to the influence of Campione powers. His speed and strength, which were already considerable in the Naruto world, could be further increased. Maybe his ability to sense danger, which was related to his ninja training, could be upgraded to a more supernatural level in the Campione world.