In this fanfiction, Naruto might use the Omnitrix to gain various alien forms' powers. He could use those powers to fight stronger enemies in the Naruto universe, like the Akatsuki members. Maybe he would use the powers for stealth or super strength depending on the alien form.
Obviously, Naruto would be one of the main characters since he has the Omnitrix. But we could also expect to see his usual friends like Sasuke and Sakura. They would be involved as Naruto uses his new powers. And perhaps some of the alien forms from the Omnitrix could be considered 'characters' in a way, as they would influence Naruto's actions and decisions.
Well, if Naruto has the Omnitrix in the fanfic, it would change the power dynamics a great deal. He could potentially access alien technology and powers that are far beyond what is normal in the Naruto world. This might lead to new alliances or enemies. Maybe the Hidden Villages would be both in awe and a bit afraid of his newfound powers, and he'd have to deal with the politics of that as well as any new threats that come his way.
One challenge could be controlling the transformations. If he can't master when and how to transform, it could put him in dangerous situations. For example, transforming at the wrong time during a battle could leave him vulnerable.
One interesting concept could be how the Omnitrix interacts with the unique chakra system in Naruto. Maybe it could transform the user into Naruto characters with added alien abilities from the Omnitrix. For example, turning into Naruto with the powers of Heatblast, allowing for a super - charged Rasengan with fire - based attacks.
Well, he'd probably be super OP. He could transform into all kinds of alien forms and use their powers in his battles. Imagine Naruto using Heatblast's powers to fight against Akatsuki members. It would be a whole new level of combat in the Naruto universe.
Well, with the Omnitrix bloodline, Naruto might gain the ability to transform into various alien forms. This could enhance his physical strength, speed, and even give him new jutsu - like an alien form might have unique energy blasts. His combat style would become more diverse, and he could surprise his opponents in new ways.
One possible interesting plot could be Harry using the Omnitrix to transform into various alien forms to battle dark wizards. For example, he might turn into a strong and durable alien to withstand powerful spells. Another plot could involve Harry trying to keep the Omnitrix a secret from his Hogwarts friends while still using it to his advantage in dangerous situations.
In a Percy Jackson has a Omnitrix fanfiction, the plot could involve Percy being sent on a special mission by Chiron. During this mission, he stumbles upon the Omnitrix. He soon discovers that the Omnitrix has some sort of connection to the Greek gods. As he uses it to transform into various alien forms, he finds that each form has a unique ability that can either help or hinder him in his quest. For example, one form might be able to swim super fast in the ocean, which is great for underwater battles, but another form might be weak against fire, which could be a problem when facing a fire - breathing monster. Along the way, he has to learn to balance his use of the Omnitrix with his own demigod skills and knowledge of Greek mythology to succeed in his mission.