One interesting 'Naruto gets super powers' fanfiction could be where he gains the power to control time. This would completely change the dynamics of his battles and how he interacts with his friends and foes. He could go back in time to prevent tragedies or leap forward to gain knowledge of future threats.
One common plotline could be Robin initially struggling to control his new super powers. For example, he might accidentally use his strength and break things around him. Another could be that he has to keep his powers a secret from his friends at first to protect them. And then there could be a villain who is specifically targeting Robin because of his newfound powers.
Well, it could be that Naruto gets some kind of elemental powers from the comet. Maybe the comet is associated with a new, rare element that Naruto can then manipulate. This new power could give him an edge in battles, as his opponents would be unfamiliar with it. He could use it in creative ways, like combining it with his existing jutsu to create even more powerful attacks.
One consequence could be that his friends and allies start to see him in a different light. They might be in awe of his new power, which could create a bit of a distance between them at first. For example, some of his less - powerful friends might feel a bit inferior or intimidated.
Often, Robin and Raven are paired in these fanfictions. Raven's dark powers and Robin's new super powers could create an interesting contrast. They might have to team up to fight a common enemy that is attracted to their combined power levels. Additionally, some fanfictions might pair Robin with other DC characters outside of the Teen Titans, like Wonder Woman. She could help Robin understand the greater scope of his powers and how they fit into the DC universe as a whole.
Well, he'd probably be even more of a badass. His already formidable combat skills combined with Wolverine's healing factor and adamantium claws would make him nearly unbeatable. He could take on stronger foes without worrying much about getting hurt. And his speed and agility from his ninja training, along with Wolverine's berserker rage, would create a really interesting and powerful character in the fanfiction world.
Well, Naruto would become extremely powerful. His combat abilities would likely be enhanced with the unique powers of arrancars. He could gain new forms and techniques. Maybe he'd have a zanpakuto-like weapon with special abilities, which would add a whole new dimension to his fighting style. Also, his speed and strength might increase exponentially, making him even more of a force to be reckoned with in the Naruto universe.
Well, if Naruto gets Shinigami powers in a fanfiction, he could potentially gain the ability to manipulate souls. He might be able to use the Shinigami's scythe in combat, which would be a really cool and unique weapon. Also, he could have new forms of jutsu related to the soul realm.
Some fanfictions might give Naruto the power of elemental fusion. He could combine fire, wind, water, earth, and lightning in ways that are not possible in the original series. This would make his attacks extremely powerful and unpredictable. For instance, he could create a storm of lightning - infused water that not only electrocutes his enemies but also drowns them.