He would be protective of the cat. Given his nature of always wanting to protect the weak, if any threats came towards the cat, Naruto would be the first to step in. He might also talk to the cat a lot, sharing his dreams and stories about his adventures, even if the cat couldn't understand his words.
In 'naruto as a cat fanfiction', Jiraiya could be an interesting character to interact with Naruto as a cat. He might see some potential in this cat - form Naruto for some new ninja techniques. The Akatsuki members could also interact with Naruto as a cat. For example, Itachi might sense something unusual about this cat when he passes through the village. And Konohamaru could be another character. He would be really excited to have a cool cat friend, not knowing it's Naruto.
In a fanfiction, a cat could be a messenger from another dimension. It comes to Naruto and Hinata, choosing them specifically. The cat leads them on an adventure to save the other dimension. Along the way, Naruto and Hinata's relationship blossoms as they rely on each other and face challenges together with the help of the cat.
The cat could make Naruto more approachable. His friends might be drawn to the cat and start spending more time with Naruto because of it. For example, Sakura might see Naruto's kindness towards the cat and start to view him in a new light, strengthening their friendship.
In 'Naruto is a cat' fanfiction, the relationships change in interesting ways. For example, his friends might treat him more protectively or find his cat - like behaviors endearing. Also, his enemies might underestimate him, which creates new plot opportunities.
Well, in a 'naruto is a cat faunus fanfiction', it could center around Naruto's interactions within the cat faunus community. Since Naruto is usually known for his energetic and somewhat goofy nature in the original series, as a cat faunus, he might get into all sorts of misadventures. He could be trying to prove himself as a capable 'ninja' despite the differences in his new form. It might also involve his relationships with other characters from the Naruto universe, who now have to view him in a whole new light as a cat faunus.
A third common theme is the idea of the underdog. Naruto was an underdog in his own ninja world, and the cat is often portrayed as an underdog as well. Together, they overcome challenges and prove that even the smallest or most overlooked can achieve great things. For instance, the cat might be a runt that Naruto helps to become strong, and in turn, the cat helps Naruto in unexpected ways.
Typically, in 'Naruto Cat Lemon' fanfiction, the Naruto universe's lore and characters are adapted. The cat aspect could bring in new, cute or mysterious elements to the story. And the lemon, if not used literally, could be used as a metaphor for something sour or challenging in the story. It could also be used to add a touch of the unexpected or quirky to the Naruto - based plot.
I would recommend 'The Cat's Blessing'. In this fanfiction, a stray cat that Naruto often feeds turns out to be a spirit in disguise. The cat spirit then plays matchmaker for Naruto and Hinata. It's a really cute story with a lot of heartwarming moments between the two characters and their interactions with the cat.