First, really understand the character of Jeremiah Valeska. Watch the Gotham series carefully to pick up on his mannerisms, his backstory, and what makes him tick. For the OC, create a detailed backstory that can realistically fit into the Gotham universe. Think about how they would interact with Jeremiah.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3). It has a large collection of Gotham - related fanfics. Just use the search bar and type in 'Gotham Jeremiah Valeska OC' and you'll get a list of relevant stories.
Jeremiah could also be a lost soul. He may have entered the dark woods either by accident or because he was running away from something in his past life, and now he has to face the unknown within those woods.
Jeremiah Johnson in this real story was most likely an individual with a thirst for adventure and a desire for self - sufficiency. He may have been driven by a sense of independence and a love for the untamed nature. He would have had to face numerous challenges in the wilderness, from dealing with wild animals to finding ways to keep warm during cold seasons. His story is probably one of a man's journey to find his place in the wild and his relationship with the land and its native inhabitants.
To write a compelling Jerome Valeska in a crossover, you need to focus on his unpredictability. He should do things that shock both the other characters and the readers. Also, emphasize his maniacal laugh and the way he toys with people. For example, if he's crossing over with a more serious - minded hero, he could use his humor and chaos to throw them off balance.
Well, in fanfiction, the relationship between Dark Bruce and Jerome Valeska can be super interesting. Some fanfics might explore how their different personalities clash. Bruce, with his sense of justice, and Jerome, being a chaotic villain. It could show how Bruce tries to understand Jerome's madness or how Jerome tries to corrupt Bruce.
Jeremiah Johnson is indeed a story with real-life inspirations. But keep in mind that in its portrayal, some aspects might have been fictionalized to add drama and entertainment value.
Partly. While the movie takes inspiration from real-life elements, it also incorporates fictional elements for dramatic effect. So, it's a blend of truth and creative license.