A possible plot for an Overwatch Reaper OC fanfiction could be that the OC is a new recruit in an anti - Overwatch group. Reaper is sent to deal with this threat, but discovers that the OC has a connection to his past that he had forgotten. This connection makes Reaper hesitate in his mission. Meanwhile, the OC has to decide whether to use this new - found knowledge to their advantage or try to reach out to the tortured soul that Reaper has become.
One plot idea could be that Battle Angel is sent on a mission to stop Reaper's latest terrorist act in the Overwatch universe. Along the way, she discovers that Reaper has a hidden motive related to his past in Overwatch. This could lead to a series of battles and tense encounters as she tries to figure out his true intentions.
One idea could be to create an OC Soul Reaper who has a unique zanpakuto ability, like the power to manipulate time on a small scale. For example, they could slow down an enemy's attack just enough to dodge it. Another idea is to make an OC who is from a different part of the Soul Society that has its own unique culture and traditions. This could add depth to the story as they interact with the more well - known parts of the Soul Society. Also, an OC with a conflicted loyalty, perhaps being half - Hollow and half - Soul Reaper, would bring in a lot of interesting plot twists.
One plot idea could be that the Overwatch heroes are transported to the Naruto universe. They have to adapt to the chakra - based powers and the different combat styles. Meanwhile, they might also introduce some of their own technology and teamwork concepts to the Naruto characters, leading to some interesting interactions and battles.
One idea could be that the Overwatch heroes are transported to the Harry Potter universe and have to learn magic to fight against Voldemort. Another could be Harry Potter characters using Overwatch - style technology in their battles against the dark forces.
One plot idea could be that Spiderman gets transported into the Overwatch universe. He has to team up with the Overwatch heroes to stop a villain who has technology that can disrupt both universes. For example, Doomfist might be interested in using this technology to gain more power, and Spiderman's agility and unique powers would be useful in the fight.
Maybe in this fanfic, the ninjas in Naruto's world discover a strange technology similar to what's in Overwatch. They try to figure out how to use it while also dealing with a group of rogue ninjas who have been influenced by a dark power, which they call the 'Ghost'. Overwatch agents then show up to help, thinking the situation is related to their own world's problems. This leads to a lot of cultural clashes and interesting interactions between the two groups.
One idea could be the Overwatch heroes being transported to the RWBY world. They could team up with Team RWBY to fight a new common enemy, like a powerful Grimm that is immune to normal attacks but vulnerable to Overwatch tech. Another plot could involve a character exchange, where a RWBY character like Ruby goes to the Overwatch world and learns about their technology and fighting styles, and then brings back new knowledge to her own world.
A more complex plot could involve a mysterious force that is causing glitches in both worlds. Some characters from Overwatch and TF2 have to work together to figure out the source of this force. For example, Tracer from Overwatch and Scout from TF2 could use their speed to scout out the affected areas while their respective teams of engineers, like Torbjörn and Engineer from TF2, try to fix the glitches in the technology.
One idea could be a story where a new character, with the power of a Grim Reaper, arrives at Beacon Academy. This character has the ability to see the souls of the Grimm and can communicate with them in a strange way. They could be initially seen as a threat but end up helping Team RWBY in a big battle against a horde of powerful Grimm.
One idea could be exploring the Black Sea Reaper's origin story. Maybe it was once a normal fisherman who was cursed by a sea witch. Another could be a story where the Black Sea Reaper teams up with other sea creatures to fight a greater evil that threatens the Black Sea. A third idea might be a love story between the Black Sea Reaper and a mermaid from a different part of the ocean.