There's a fanfic called 'The Fearful Alliance'. In this one, Crane teams up with Batman, albeit reluctantly at first. It's interesting because it shows how two characters with such different motives can find common ground. It has some really cool action scenes and in - depth character dialogues.
The mystery around Jonathan Crane makes the fanfiction interesting. He's a complex character with his fear - based motives. When paired with Batman, it creates a lot of tension and drama.
Well, Harry Potter could use his magic skills to help Jonathan Crane face his inner demons. Maybe he could use a spell to calm Crane's fear-induced madness.
One scenario could be that Harry uses his invisibility cloak to help Crane study his patients without being noticed. This would allow Crane to get a more accurate understanding of their behaviors.
A great plot could be that the OC is a scientist herself, specializing in neurology. She is invited to a symposium in Gotham where she meets Crane. They start off as professional rivals, but Crane is intrigued by her knowledge and her different approach to fear. He then tries to manipulate her into joining his unethical experiments. Another plot might be that the OC is an artist who uses fear as an inspiration for her work. Crane, upon seeing her art, believes she can be a key to his next level of understanding fear, so he tries to get closer to her. And finally, the OC could be a forensic investigator who is on the case of Crane's crimes. As she digs deeper, she gets too close for Crane's comfort, and he has to deal with her presence in his life.
To develop the OC, start with her appearance. Does she have a distinct look, like wild hair or unique tattoos? This can make her stand out. Then, focus on her goals. If she's in Gotham, what does she want to achieve? It could be to expose Crane's crimes or to find a cure for a fear - related illness. Also, her relationships with other characters are important. Maybe she has a best friend who warns her about Crane, or a family member who has been affected by Crane's actions. This all helps to build a complex and interesting OC. For example, if she has a sister who was a victim of Crane's fear toxin, it will greatly influence her actions and attitude towards him.
Alec and Isabelle could be important characters too. As part of the shadowhunter group, they have the skills and resources to track down Jonathan. They could be the ones who gather intelligence on Jonathan's whereabouts and plan the rescue strategy, while also dealing with their own personal issues and relationships within the group.
One of the descendants could be Giorno. Giorno has his Golden Experience Stand and is quite different from Jonathan in many ways. He's part of the new generation of the Joestar family. Also, Josuke could be among those he meets. Josuke is known for his Crazy Diamond Stand and his strong sense of justice, which he may have inherited in part from Jonathan.