Well, you could create an OC that is a time - traveler and gets stuck in Rumple's era. This OC could either help Rumple become a better person earlier on or accidentally make things worse. Also, an OC that is an artist and uses their art to try and break through Rumple's tough exterior. Maybe an OC who is a detective - like figure trying to solve the mysteries around Rumple's actions and motives.
An interesting Rumple OC fanfic could involve an OC who is a spirit guide. This spirit guide OC could be sent to guide Rumple towards redemption. Or, an OC who is a refugee from another magical realm that Rumple takes advantage of at first but then grows to care for. You could also write about an OC who is a young wizard in training and sees Rumple as a sort of mentor figure, but soon realizes Rumple's darker side.
One popular OC is Aria. In the fanfics, she is a kind - hearted healer who attempts to heal Rumple's broken heart. There's also Damian, an OC that is a thief who gets caught up in Rumple's web of magic. And Sophia, an OC who is a fairy that tries to use her magic to counter Rumple's dark magic.
Another Rumple OC fanfiction could involve an OC from another realm who accidentally ends up in Rumple's world. This OC is a healer with a heart of gold but is completely out of their element in a world filled with magic and power - hungry individuals. Rumple sees the potential in using the OC's healing abilities for his own gain, but the OC resists and tries to find a way back home while also making positive changes in Rumple's world.
Imagine a Loki OC who is a half - Asgardian, half - Vanir orphan. This OC has been living on the fringes of society, but Loki discovers their existence and decides to use them for his own schemes at first. However, the OC's pure heart and kind nature start to change Loki's perspective, and they end up on an adventure together to uncover a long - lost secret about their shared heritage.
One idea could be a Firebender OC who is a prodigy but struggles with the dark side of their power. They could be on a journey to master their abilities without succumbing to anger and aggression. Another idea is a Firebender OC from a small, forgotten tribe who discovers a unique form of Firebending that has been lost for centuries. This could lead to a story where they have to protect this knowledge from those who would misuse it.
Another option is an OC who is a Hollow with a very human - like personality. This Hollow could be on a journey to regain their humanity, and their story could explore the nature of Hollows and the line between good and evil in the Bleach universe.
One idea could be an OC who is a transfer student to Beacon Academy. They could have a unique weapon and fighting style, like a sword that can split into two daggers for close - combat. Another idea is an OC from a different kingdom with a special Semblance related to nature, such as being able to control plants. A third idea might be an OC who is an outcast in their own village because of their strange Semblance, and they come to Beacon to find a place where they belong.
Well, you could have an MHA OC who is a villain - turned - hero. Their backstory could involve being mistreated and turning to villainy, but then being inspired by the heroes to change their ways. Maybe they have a quirk that involves shadow manipulation, which they used for evil before but now use for good. Or an OC that is a tech - genius and creates their own high - tech hero gear, much like Mei Hatsume but with their own unique style. Also, an OC with a healing quirk could be interesting, especially if they have to deal with the moral dilemma of whether to heal villains or not.
An OC could be a time - traveling fan of Kakashi. They come from a future where Kakashi is a legend. The OC tries to change certain events in Kakashi's past to make his life easier, but in doing so, they create unforeseen consequences. This could lead to an interesting dynamic where Kakashi has to figure out what this strange person is doing and why.
One idea could be creating an OC who is a long - lost relative of one of the main characters in Ravenswood. This OC could come to town with a mysterious past and a special power that is somehow related to the town's secrets.
Well, a great Kamui OC fanfic could focus on a love story. Suppose an OC, a kind - hearted healer, falls in love with Kamui. Their relationship would be full of challenges, like Kamui's dangerous missions getting in the way. Or you could do a time - travel fanfic. Kamui travels back in time and meets an OC who is a key figure in an ancient prophecy related to his powers. This could lead to all sorts of adventures and revelations.