There could be a jutsu that allows for instant teleportation across long distances. This jutsu might be a new discovery in the fanfiction world, perhaps created by a character who has been experimenting with space - time ninjutsu. They might use it to quickly get in and out of battles or reach far - off places in a blink.
One possible fanfiction idea could be Naruto using his henge technique to transform into someone wearing a really cool swimsuit. Maybe he does it for a mission at a beach resort where he has to blend in with the tourists. He could transform into a famous surfer and use his skills to gather information.
Well, Naruto could learn more about empathy. By being in Inari's form, he experiences life from Inari's perspective. This might make him more sensitive to the feelings of others who are not as confident or strong as he is.
He might also get help from his friends. For instance, Sasuke could sense that something is wrong with Naruto. With his Sharingan, Sasuke might be able to see through the henge and then use his own powers to help Naruto break free. Or Sakura could use her medical ninjutsu knowledge to somehow counter the effects of the henge on Naruto.
One possible fanfiction could be that Naruto henge into a swimsuit as a prank. He might transform into a ridiculous swimsuit -covered version of himself to make his friends laugh. For example, he could turn into a swimsuit with a huge fish pattern all over it and start acting like a goofy mermaid in front of Sasuke and Sakura, just to break the tense mood during a training session.
Most likely not. The combination of 'panties' in the title gives the impression that it could involve inappropriate or at least very juvenile and not - so - family - friendly content. Naruto is a popular franchise that is enjoyed by a wide range of ages, and such a fanfiction concept seems to deviate from the more positive and acceptable themes usually associated with the series.
Maybe Sasuke. Although they are rivals, they also have a deep bond. Sasuke might have come across a unique jutsu during his travels and decide to teach it to Naruto so that they can both become stronger and better protect their village.
He might learn a time - traveling jutsu. This would be really cool as it could allow him to go back and change certain events in the Naruto world, or gain knowledge from the past to use in the present battles.
Sasuke could be a rival. He's always been highly skilled and competitive. His Sharingan could potentially see through some of the henge master's henges, creating a constant challenge for the henge master to come up with more advanced henges.
The Solid Henge could be different in that it has a physical mass and durability. Regular henge is mainly for illusionary transformation, but the Solid Henge in fanfiction could be used to create actual objects that can be interacted with. For example, Naruto could create a solid bridge over a chasm instead of just the illusion of one.