Itachi can be a very interesting character in Naruto omega mutant fanfiction. His past actions and his own powerful abilities can contrast and interact with Naruto's omega mutant nature. Jiraiya is another one. He could be the one who first discovers Naruto's mutant abilities and helps him start on the path of understanding and mastering them. Then there are the Akatsuki members, whose motives and actions can be affected by Naruto's new omega mutant status.
In this type of fanfiction, characters like Itachi might be very popular. His already - complex character can be made even more so with omega - level mutant powers. He could have the power to manipulate shadows in a more extreme way, similar to a mutant ability. Also, Rock Lee could be popular if he is given mutant - like super strength and speed that take his taijutsu to a whole new level.
Often, original characters created by the fanfic authors themselves become popular. These are the ones with really unique omega level powers and interesting backstories. For example, a character who can control all forms of energy and has a tragic past of being experimented on by an evil organization.
Some original omega - level mutants created specifically for the fanfiction can also become popular. For example, an omega - level mutant with the power to manipulate time might be a really cool and popular character. Their interactions with the SI character and how they use their power to change or protect the mutant world can make them stand out.
It could be an original omega mutant character created specifically for the fanfic. This character might have abilities that are a blend of Naruto - like ninja skills and mutant - like powers.
Well, Naruto is the most obvious main character. He would be exploring the boundaries of his powers in this fanfiction world. But it's possible that some mutant - like characters from the Naruto universe, like Gaara with his sand - controlling abilities that could be seen as mutant - like, could also be main characters. Additionally, new characters created specifically for this fanfiction that bridge the gap between Naruto's world and the mutant concept could be main characters as well.
Arya Stark is sometimes reimagined as an omega in fanfiction. Her skills as a faceless assassin could take on a new dimension in an omega - centric story, using her stealth and ability to change identities to navigate the challenges of being an omega in a harsh world.
One interesting story could be about an omega Naruto who discovers a unique mutant ability that changes the way he is perceived in the ninja world. Maybe he can communicate with animals in a new way. This ability helps him in his missions and also makes his relationships with his friends, like Sasuke and Sakura, more complex and interesting.
Well, in 'Naruto omega level mutant fanfiction', there might be the idea of mutant - like transformations in the Naruto universe. Imagine Naruto himself having a transformation that gives him omega - level mutant strength and abilities. Also, the exploration of different chakra natures as mutant - like powers. Fire - style chakra could be seen as a mutant power related to heat and combustion.
It might not be a mainstream popular concept. The 'Harry Potter' and'mutant' universes are quite distinct in their original forms. Combining them in such a way might be a niche idea within the fanfiction world, appealing mainly to those who like to create very unique crossovers.
It's hard to say for sure without reading it, but it could include Naruto himself. Maybe he has a different role in this fanfiction, like being involved in the omega - related events in a special way.