One good example could be a story where Joss Carter discovers she's pregnant and John Reese is there to support her. In this fanfic, Reese might use his skills to keep her safe during the pregnancy, like ensuring no enemies target her because of her condition.
In many of these fanfictions, their relationship becomes more intimate. The pregnancy is like a catalyst. For example, Reese, who was always a bit guarded, might open up more and show his softer side as he takes on the role of being there for Carter during her pregnancy.
One common theme is the idea of partnership. The OC often becomes a partner to Reese in his fight against crime or in his attempts to protect people. Another theme is discovery. Reese discovers new things about himself or his world through his interactions with the OC. Also, redemption can be a theme, where either the OC or Reese is on a path of redemption and they help each other in that journey.
Sure. One great John Reese OC fanfiction is 'The Unseen Ally'. It has an interesting plot where the OC character helps Reese in his missions in unexpected ways. Another one could be 'A New Perspective' which delves deep into how an OC's presence changes Reese's outlook on certain things. And 'OC's Intervention' is also quite good, showing how the OC gets involved in Reese's world and the consequences that follow.
One idea could be a crossover where Naruto somehow gets transported to the world of John Carter. Maybe he teams up with John Carter to fight against a common enemy in Barsoom. They could combine their unique fighting styles, like Naruto's ninjutsu and John Carter's swordsmanship.
Well, Naruto and John Carter are the must - haves. But in addition, Tars Tarkas from the John Carter world could also be a main character if he somehow ends up in the Naruto world. His unique appearance and honor - bound nature would make for an interesting addition. And from the Naruto side, Sasuke could be a key character. He might initially be suspicious of John Carter but later come to respect him and work together in some battles.