Yes, in fanfiction, the possibilities are almost endless. Writers can create scenarios where Naruto has the ability to transform into a cartoon-like form. It could be a really creative and unique take on the character, adding new elements to the Naruto universe within the realm of fan - created stories.
There probably is. Fanfiction allows for all sorts of wild and creative ideas. Given Naruto's own abilities to transform, like his Nine - Tails form, it's not too far - fetched for a fan to write a story where he can turn into a dragon. You could try searching on popular fanfiction websites using relevant keywords to find such a story.
He could turn into a T - Rex. It's one of the most iconic dinosaurs, known for its powerful jaws and great strength. Naruto as a T - Rex would be a fearsome sight with his massive size and ability to crush opponents.
If Naruto was an Armored Titan in a fanfiction, he'd be a force to be reckoned with. His speed and agility as a ninja would likely transfer to the Titan form, making the Armored Titan much more mobile. He could also use his Rasengan in the Titan form, maybe by concentrating chakra into the Titan's fist.
One idea could be that Naruto somehow gets transported to the world of Attack on Titan and gains the power of the Armored Titan. He might use his ninja skills in combination with the Titan's strength. For example, his shadow clone jutsu could be used to create distractions while the Armored Titan attacks enemies head - on.
In some fanfictions, Naruto might turn into elements through special training with a hermit or a secret jutsu he discovers. For example, he could have a chakra - based transformation that allows him to become like fire, water, or earth, similar to how he masters different types of chakra in the original series but with a more elemental focus.
Well, it could be due to a bloodline limit that was previously unknown. Naruto might have some distant ancestor with the ability to transform into a wolf, and through some circumstances, this latent ability surfaces. Or perhaps he made a deal with a powerful wolf - spirit in a mysterious forest, and as part of the deal, he gained the ability to turn into a wolf.
Speed. Wolves are known for their speed, and Naruto in wolf form could move much faster than in his normal human form. This would be a great advantage in chasing enemies or getting to a location quickly.
One possible reason could be some sort of ancient bloodline connection. Maybe there was a long - forgotten ancestor who had a pact with the fox spirits, and that power has been dormant in Naruto's bloodline until it gets activated somehow. Another reason might be due to a powerful jutsu that was cast on him as a baby, a jutsu that was meant to protect him but also had the side effect of giving him the ability to turn into a fox.
Perhaps he could ask some of his more well - read friends in the ninja world who might have some sort of magical or technological means of accessing other fictional universes' fan works. Another option could be to visit some local libraries in the hidden villages that might have some sort of secret section for fan - created works from other worlds. However, this is all very far - fetched and in the realm of fun speculation.