One possible storyline could be that Kalawarner somehow ends up in the Naruto universe. She might be confused at first but then use her own skills to help Naruto and his friends in a battle. Maybe she has some unique powers that are useful against a new enemy.
Another possible plot is that there is a prophecy in both their worlds about a combined force of them being the only hope. So, they are brought together by some mysterious force. At first, they don't trust each other but as they face challenges together, they learn to work as a team. They might combine their powers in unexpected ways to defeat a powerful villain that threatens both of their worlds.
One common theme is the idea of different worlds colliding. Naruto is from the ninja world and Kalawarner from another realm entirely. Their interaction often explores how two very different cultures and power systems can co - exist or clash.
One possible storyline could be how the Hidden Leaf Village copes with his death. Maybe there are power struggles as different clans vie for leadership in the absence of Naruto's unifying presence.
One common theme could be adventure. Since Naruto is known for its action - packed adventures, fanfictions might incorporate new adventures for the characters. Another theme could be friendship, as Naruto values his friends highly in the original series.
One possible storyline could be that Naruto is chosen as a temporary Kazekage due to a threat that requires his unique skills. He then has to deal with internal conflicts within the Sand village while also facing external enemies. Another could be that there is some kind of prophecy that only Naruto can fulfill as Kazekage to save both Konoha and Suna.
One possible storyline could be Naruto as an elf trying to fit into the ninja world while still having his elf heritage. He might face discrimination from some who don't understand his different nature.
In a Naruto and Derieri fanfiction, a possible storyline could be that Derieri is mistaken for an enemy in the Naruto universe. Naruto, being the one to see her potential for good, tries to convince others that she is not a threat. As they try to clear her name, they uncover a conspiracy that threatens both their worlds. This would involve a lot of mystery - solving and action as they race against time to stop the conspiracy.
Yes, there might be some interesting 'Naruto and Kalawarner' fanfiction. You can start by looking on popular fanfiction websites like FanFiction.net or Archive of Our Own. However, it might be a rather unique crossover, so the quantity might not be as large as more common crossovers.
Another idea is that Naruto, while on a mission, stumbles upon a portal that leads him to the world of the Thundercats 2011. There, he meets Cheetara and they form an alliance. They could face off against common enemies like powerful villains from both universes who are trying to take over both worlds.
One possible storyline could be that Naruto has to go on a dangerous mission that might cost him his life. Temari is in love with him but can't stop him. She's sad because she might lose him. Another could be that there are political tensions between Konoha and Suna again, and they are forced apart due to their loyalty to their respective villages. They're sad as they have to give up their relationship.
Well, in some 'naruto loses arm fanfiction', it might be a result of a forbidden jutsu gone wrong. Naruto might be exploring a new and dangerous form of power, and the price is his arm. This would then set off a chain of events where he has to find a way to either get his arm back or adapt. He could also face discrimination from some in the ninja community who see him as weakened, but he'd prove them wrong by his unwavering spirit.