One plot idea could be that the Fire Keeper from Dark Souls is transported to another world in the crossover. There, she has to adapt to new rules and powers. Maybe she meets characters from the other universe who initially mistake her for something else due to her unique appearance and abilities from Dark Souls. Another idea is that she teams up with a character from the crossover world to fight a common enemy that threatens both of their realms. This enemy could be a powerful being that feeds on the essence of different worlds, and their combined knowledge and skills are the only hope to stop it.
A possible plot could involve the Fire Keeper's power being corrupted in the crossover. As a result, she starts to lose her connection to the Fire in Dark Souls and gains some strange new powers that are a mix of both universes. Characters from the crossover world either fear or try to use her for their own gain. Meanwhile, she has to find a way to restore her original power and save both worlds from the chaos that her corrupted state is causing. For example, she might have to seek out a special artifact that can purify her power.
One plot idea could be the Fire Keeper's journey to discover her true origin. Maybe she starts having strange dreams that lead her to explore forgotten areas of the game's world. Another could be a love story between the Fire Keeper and an unnamed warrior. They meet during the warrior's journey to link the fire and gradually fall in love, but their love is tested by the harsh realities of the Dark Souls universe. A third idea is that the Fire Keeper gains the ability to see the future and tries to change the fate of the world, which goes against the natural order of things in Dark Souls 3.
A more emotional fanfiction could focus on the relationship between the Fire Keeper and the Ashen One. What if the Fire Keeper develops feelings for the Ashen One that are more than just her duty - bound connection? This could lead to a complex and interesting story, with her having to balance her emotions with her important role.
Some 'Dark Souls Fire Keeper' fanfictions are about her role in a different timeline. What if the events in the game happened differently? Maybe she becomes a more active fighter instead of just a keeper. There could also be a fanfiction that delves into her dreams and visions. Since she has a connection to the First Flame, she might have prophetic dreams that could lead to new adventures or revelations. Additionally, a fanfiction could explore how she copes with the loneliness of her role and the constant cycle of death and rebirth in the Dark Souls universe.
One idea could be exploring the origin of the Age of Fire from the perspective of an unknown character. Maybe a commoner who witnesses the first spark of the Age of Fire and their journey to understand its significance.
One idea could be that the characters from RWBY are transported into the Dark Souls universe. They have to adapt to the harsh and unforgiving world, facing the difficult enemies and complex level designs. For example, Ruby could use her scythe skills in the Dark Souls combat system, but find that the enemies are much more resilient than the Grimm she's used to.
One idea could be a crossover with 'The Lord of the Rings'. Picture the Dark Souls characters in Middle - earth, facing off against orcs and other dark creatures. Another could be a crossover with 'Bloodborne'. The gothic and nightmarish settings of both could blend well, with hunters and Dark Souls' warriors teaming up against a greater evil. A third idea might be a crossover with 'Final Fantasy'. The different magic systems and character classes could create really unique and exciting storylines.
A crossover with 'Final Fantasy' would be cool. The magic systems in both could be combined in interesting ways. For example, a Dark Souls 2 mage could learn some spells from a Final Fantasy character. Also, a crossover with 'The Elder Scrolls' series. The vast open worlds of both could create an amazing setting for the fanfiction. The character could explore different regions of Tamriel and use their Dark Souls 2 abilities to survive.
To develop the Fire Keeper's character, you could start by exploring her backstory more deeply. Maybe in the crossover, she has flashbacks to her life before becoming a Fire Keeper. This could add more layers to her personality. Another way is to put her in situations that force her to change. For example, if she has to deal with a new type of magic in the crossover world, she might have to learn to adapt and grow in her understanding of magic.
The Ashen One is an obvious choice. Their connection in the game can be explored further in a fanfiction. They have a relationship based on the goal of the Ashen One's journey and the Fire Keeper's role. Another good character to pair with her could be the Emerald Herald. They both have a somewhat otherworldly quality and their interactions could bring out new aspects of the story. Also, the Siegward of Catarina could be interesting. His chivalrous nature could contrast with the Fire Keeper's more mysterious and ethereal presence, creating some great character dynamics.
One idea could be exploring Yorshka's origin in more depth. Maybe she has a hidden past that involves a powerful being from another realm. Another plot could revolve around her relationship with the player character. For example, they form an unexpected alliance to face a common threat in the Dark Souls 3 world. A third plot idea could be that Yorshka discovers a long - lost power within herself that changes the balance of power in the game's universe.