One common theme is the exploration of relationships between male characters from Naruto and the other crossover series. It often delves into their emotional bonds and how they develop in a romantic or sexual context in the yaoi aspect.
I'm not sure which specific 'naruto crosover yaoi fanfic' you would like. But if you search on platforms like FanFiction.net, you can filter the results by 'Naruto' and 'Yaoi' and see what crossovers are available. Maybe there are some really interesting ones that cross Naruto with other popular shonen or seinen series in a yaoi - themed way.
One idea could be a Naruto and Harry Potter crossover. Picture Naruto arriving at Hogwarts, his ninja skills and chakra creating chaos among the wizards. Another could be a Naruto and One Piece crossover, where Naruto's team sails with the Straw Hats, facing off against the Akatsuki and the Marines. And a Naruto and Bleach crossover, with Naruto and Ichigo teaming up to fight Hollows and rogue ninjas.
To begin a naruto crosover fanfiction, start by choosing a crossover that really interests you. If it's a Naruto and Lord of the Rings crossover, for instance, you need to understand both universes well. Read up on the lore of both. Then, find a common ground for the story. Maybe Naruto is sent to Middle - earth to help fight Sauron. Develop your main characters' roles in this new setting. You can start with a simple scene, like Naruto arriving in Middle - earth and being confused by the new environment, and then expand from there.
His old team would be Sasuke, Sakura, and Kakashi. They are the main characters associated with Naruto's early team experiences. In the context of this fanfic where they die, it's likely to have a huge impact on Naruto and the overall story.
Common themes in 'naruto old man fanfic' include the passing of the torch. Naruto has to prepare the next generation to take over the protection of the village. Another theme is the continuation of the ninja way. He has to ensure that the values he fought for, like friendship, loyalty, and perseverance, are carried on. Also, there can be themes of nostalgia, as he remembers his old friends and enemies, and how those memories shape his actions and decisions in his old age.
Naruto would likely be devastated. His old team was an important part of his early life in the ninja world. He might initially go into a state of shock, unable to believe that they are gone. Then, his grief could turn into anger, vowing to find out who was responsible and make them pay.
One common theme is the passing on of knowledge. Since Naruto is old, he has a wealth of experience to share with the characters from the other crossovers. Another theme is the idea of facing new challenges in old age. Naruto may be past his prime physically, but his wisdom and spirit are still strong.
In certain 'naruto old man fanfic', the story could revolve around Naruto facing new threats in his old age. Despite his age, he still has his ninja skills and his indomitable spirit. These fics might show him using his experience and unique abilities to protect the village once again, perhaps in a different way than he did in his youth, and also how his old age has both its limitations and advantages in combat and decision - making.
One popular 'Old Man Naruto Time Travel Fanfic' is 'Return of the Kage'. In this fanfic, Naruto travels back in time with all his wisdom and power from being an old man. It has great character development and interesting plot twists.