Another concept could be that Naruto's chakra has some strange effect on Widowmaker. When they accidentally come into contact, it stirs something within her that starts to break the mind control she is under. This then makes her question her loyalty to Talon, and she and Naruto form an unexpected alliance to fight against the real threat that is manipulating both their worlds.
One idea could be a story where they are on a joint mission. Despite their different personalities and combat styles, they start to rely on each other more and more. As the mission progresses, they discover a common enemy that threatens not just their world but also their new - found friendship. This forces them to work even closer together, leading to a deeper bond.
One idea could be a crossover with the 'Mass Effect' universe. Widowmaker could be a new type of biotic agent, with her unique skills and backstory adding a new layer to the 'Mass Effect' story. For example, she might be a character that Cerberus tries to recruit.
One plot idea could be that the Reader is a new recruit in Widowmaker's organization. The Reader is initially scared of Widowmaker but gradually discovers her past and the reasons for her current state. They develop a bond based on empathy and trust as the Reader tries to help Widowmaker come to terms with her inner turmoil.
A more character - driven idea would be that Naruto and Yato meet and learn from each other's outlooks on life. Naruto, who has always fought for his friends and village, could teach Yato about the importance of having a strong community. Yato, who has a very different view of the afterlife and the divine, could show Naruto a whole new perspective on existence.
One interesting idea could be Orochimaru seeing Naruto as a unique specimen and instead of just trying to use him, he actually starts to respect Naruto's willpower. This could lead to a strange mentorship of sorts where Orochimaru teaches Naruto some of his more unorthodox jutsu in exchange for Naruto trying to help Orochimaru find a new path that doesn't involve so much darkness.
One idea could be a story where Naruto and Tsume go on a mission together in an unknown territory. They face various challenges and have to rely on each other's skills. Naruto's optimism might contrast with Tsume's more serious nature, creating an interesting dynamic.
Another idea is that Bayonetta somehow ends up in the Naruto universe. She might be mistaken for a powerful ninja at first. Then she could start teaching some of the ninja new combat techniques inspired by her own moves, while also learning about chakra and how it differs from her own power source.
Well, a cool concept could be that Naruto discovers Sarada has a unique power that is similar to his own but also very different. He then decides to mentor her privately, and during this process, they form a strong bond that is not just about master - student but also a deep friendship. They could also face some challenges from the village elders who are skeptical about their relationship.
One idea could be Naruto being summoned into the world of FF14. He might initially be confused but quickly adapt his ninja skills to the new environment. For example, his ability to use chakra could be translated into a unique form of magic in FF14.
In a 'naruto x renamon fanfiction', there could be a prophecy that only the combination of the power of the Nine - Tailed Fox within Naruto and Renamon's true form power can defeat an ancient evil that is about to awaken in both their worlds. They have to overcome cultural differences and language barriers at first, but as they get to know each other better, they develop a deep friendship and work towards fulfilling the prophecy.