One idea could be that the Dragonborn and Ingun Black - Briar team up to expose the dark secrets of the Black - Briar family. They might start by investigating the skooma trade that the family is rumored to be involved in. The Dragonborn's skills in combat and persuasion, combined with Ingun's knowledge of the family's inner workings, could make for an exciting adventure.
One idea could be that the Dragonborn and Ingun Black - Briar team up to solve a mystery in Skyrim that involves a powerful magic lemon. Maybe this lemon has the power to either heal the land or cause great destruction, and they must figure out how to control it. Another plot could be a love triangle between the Dragonborn, Ingun, and someone else who is also after the secrets of the Black - Briar family and the special lemon.
Their relationship could start off as a reluctant alliance. The Dragonborn might initially be wary of Ingun due to her association with the Black - Briar family. But as they face common enemies and challenges, they begin to trust each other more. For example, when they are both targeted by a group of necromancers, they have to rely on each other's skills to survive.
A more humorous plot could be that the Dragonborn accidentally turns Maven Black - Briar into a lemon. Now, the Dragonborn has to find a way to reverse the spell while dealing with the chaos that ensues in Riften without its powerful leader. Along the way, they learn more about Maven's true nature and the importance of lemons in some of the local rituals that Maven was secretly involved in.
They could start off as strangers. Maybe the Dragonborn is passing through and sees Ingun in trouble, like being harassed by some ruffians. He steps in to save her, and she thanks him with the gift of the special lemon. This small encounter starts their relationship, and as they talk more, they find out they have common goals, like protecting Skyrim from a new threat. This shared purpose brings them closer together.
There could be a fanfiction where the dragonborn is in a romantic relationship with Maven Black - Briar. However, this relationship is full of challenges as the dragonborn's heroic nature often clashes with Maven's more self - serving and sometimes underhanded ways. They constantly struggle to find common ground while dealing with the various threats to Riften.
One idea could be that the female Dragonborn initially sees Alduin as a great threat. But as she delves deeper into the lore and her own powers, she discovers a connection to him that was long forgotten. Maybe they have to team up against an even greater evil that is emerging in the world of Skyrim.
One idea could be exploring how the Dragonborn and Serana deal with the impending arrival in a world filled with danger. Maybe they have to find a safe haven away from all the threats. Another plot could be about the reactions of their friends and allies. Some might be overjoyed, while others could be worried about how this new addition will affect their quests and battles.
A really cool plot idea could be that the OC Dragonborn has a split personality. One side is a fearless warrior, ready to take on any dragon or foe. The other side is a pacifist who tries to find non - violent solutions to problems. This internal struggle could be a major part of the fanfiction, as they deal with the challenges of being the Dragonborn in Skyrim and having these two conflicting natures.
One idea could be that the Dragonborn is forced to make a pact with a Daedra to gain power to defeat a great evil, but then has to deal with the consequences of that pact. For example, the Daedra might demand certain sacrifices or tasks in return.
Perhaps a plot where the dragonborn has to adapt to the modern world of Highschool DxD while also hiding their true nature. They might struggle with the different social norms and also have to keep their dragon powers a secret from most people, except for maybe Issei and his friends who could help them fit in.