Well, some OCs in Death Note fanfiction could be a psychic who can sense the presence of the Shinigami. This psychic might be drawn to the chaos that the Death Note is causing and try to use their powers to stop it. There could also be an OC who is a member of an underground organization that has been secretly studying the Death Note for years. They have their own motives, maybe to gain power or to prevent the wrong people from getting their hands on it. And an OC as a street - smart kid who stumbles upon the Death Note and has to make a choice between using it for personal gain or trying to destroy it, which would add a whole new perspective to the story.
An interesting OC fanfiction could be about a Death Note owner who doesn't want to use it for evil but for good in a very specific way, like only targeting truly heinous criminals who keep escaping justice. They could have moral dilemmas throughout the story.
One interesting concept could be Naruto getting his hands on the Death Note. Imagine how his ninja values would conflict with the power of the Death Note. He might be tempted to use it for what he believes is justice in the ninja world, but his sense of right and wrong within his own moral code would be put to the test.
Well, in scp death note crossover fanfiction, a cool concept is the clash of different power systems. The SCP entities have their own unique and often bizarre abilities, and when combined with the Death Note's ability to kill just by writing a name, it creates a really chaotic and interesting scenario. Maybe some SCPs would try to find a way to nullify the Death Note's power or use it to their own advantage in their never - ending pursuit of chaos or control.
Well, in 'kaneki crossover death note fanfiction', a possible concept is the way their different worlds collide. Kaneki comes from a world full of ghouls and the CCG, and Light is in a world where he's using the Death Note to change society. If they were to meet, it could lead to some really intense power struggles. Also, the idea of how their respective allies and enemies would react to the crossover is quite fascinating. Kaneki's friends from Anteiku might be completely bewildered by the Death Note, and Light's accomplices might see Kaneki as a new threat or a potential tool.
One interesting OC concept could be a high - flying daredevil OC who has a unique backstory of growing up in a circus and using those acrobatic skills in the WWE ring. Another could be an OC with a mysterious martial arts background, bringing in different fighting styles to WWE matches.
One interesting Death Note Genius OC Fanfiction could be about an OC who has the power to reverse the effects of the Death Note. This OC might use this power to save those who were wrongly targeted. Another could be an OC detective who is as brilliant as L and is able to outwit Kira. There are also fanfictions where an OC is a Shinigami who befriends Light and tries to change his fate.
One idea could be to create a Shinigami OC who is a bit of an outcast among the Shinigami. Maybe this OC doesn't like the idea of just writing names in the Death Note and wants to find a more 'humane' way to deal with humans, which could lead to all sorts of interesting conflicts with other Shinigami. For example, they might try to influence humans in a positive way before their time is up instead of just causing their death.
One interesting OC concept could be a detective with a special ability like super hearing. They might be able to pick up on small sounds that help in solving cases, much like Conan's sharp observational skills but in a different way.
One interesting OC concept could be a character with the power to manipulate time in the Mortal Kombat universe. This would add a whole new dynamic to the battles and storylines. For example, they could freeze time to dodge attacks or rewind time to correct a wrong move. Another could be an OC from a different realm entirely, with unique fighting styles and cultural backgrounds that contrast with the existing Mortal Kombat characters.
One interesting OC concept could be a vampire hunter who has a personal vendetta against the Lost Boys. They might be a skilled fighter with unique weapons.