The 'power - up' trope is also popular. For instance, Naruto could gain some knowledge from Captain Price's military strategies and use it to enhance his ninja skills, or Captain Price could get some sort of power - up from Naruto's world, like being able to use a bit of chakra for his own advantage in combat.
A common trope is the 'Mentor - Student' relationship. Captain America often takes on the role of teaching Izuku about leadership, courage, and combat skills. For example, in many fanfics, he helps Izuku become more confident in his abilities.
One popular trope is the 'fish - out - of - water' story. For example, when Captain Marvel first arrives in the Harry Potter world, she's confused by all the magic. It's fun to see her adapt. Another is the 'team - up' trope, like Harry and his friends joining forces with Captain Marvel to take on a big bad. They combine their skills and powers.
One popular trope is the mentor - mentee relationship. Tsunade often acts as a mentor to Naruto, guiding him in areas like control over his power or in understanding the politics of the village. Another is the adventure trope, where they go on an adventure together, facing various enemies and obstacles along the way.
One popular trope is the 'Enemy to Allies' trope. Since Scorpion is from the Akatsuki and Naruto is a Konoha ninja, they start as enemies. Fanfictions often explore how they can put aside their differences and work together. It adds a lot of drama and tension.
One popular trope is the 'fish out of water' scenario. Hellboy suddenly finds himself in Naruto's world full of ninjas and strange customs, or vice versa. Another is the 'team - up against a greater evil'. They have to combine their powers and skills to defeat a powerful foe. The 'culture clash' trope is also common. Naruto's positive and energetic ninja culture clashes with Hellboy's more somber and dark world view.
One popular trope is the 'Redemption Arc' for Konan. In many fanfictions, Naruto helps Konan move past her dark past with Akatsuki. For example, in some stories, he shows her the true meaning of peace, and she starts to fight for a better world.
In Naruto reality manipulation fanfiction, the 'chosen one' trope is popular. A character is destined to have reality manipulation powers to save the Naruto world from a great threat. The 'reality - sharing' trope is also seen, where characters can share their reality manipulation powers with others. Additionally, the 'reality - locked areas' trope exists, where certain parts of the Naruto world are locked away by reality manipulation and the characters have to find a way to unlock them to progress the story or gain some sort of knowledge or power.
The 'romantic triangle' trope can also be found in some 'Naruto and Temari and Ino' fanfictions, although not always in a traditional sense. Sometimes it's more about unrequited feelings or the confusion of young love among the three. Also, the 'character growth through each other' trope is popular. They learn from one another's strengths and weaknesses, like how Naruto's never - give - up attitude can inspire Temari and Ino.
One common trope is the 'Forbidden Love' between Naruto and the female Kyuubi. Since she is a powerful and somewhat dangerous being, their relationship is often seen as something that goes against the norms of the ninja world. Another trope is the 'Power - Up' trope, where Naruto gains new and stronger abilities through his connection with the female Kyuubi.
A less common but interesting trope is the 'reincarnation' trope. It could be that a character from the Frieza race is reincarnated in the Naruto world with some of their past memories. This leads to a strange connection between the two universes as this character tries to figure out their new life while still having the instincts and knowledge of their Frieza race past. It can create some really unique storylines and character developments.