Perhaps the baby girl is actually a key to Eyeless Jack's past. She has a certain aura or memory that is linked to his forgotten history. This causes Eyeless Jack to be drawn to her, and as the fanfiction progresses, they both embark on a journey to uncover his past through her mysterious connection.
Another idea is that the baby girl is a new creation in Eyeless Jack's realm. She has unique powers that are slowly emerging. As she grows, Eyeless Jack takes on the role of a mentor, guiding her to control her powers and use them for good, or at least for their own survival in that strange and often cruel world.
Eyeless Jack can be developed by showing his softer side when interacting with the baby girl. For example, he might be more patient and gentle, which is a contrast to his usual menacing reputation. This can add depth to his character.
A good plot for Eyeless Jack crossover fanfiction might be a crossover with a magical realm. Imagine Jack finding himself in a world of wizards and witches. He would be an enigma to them, and his appearance and abilities would likely cause a stir. They might try to either banish him or use him for their own purposes. Another option is a crossover with a horror - comedy universe like "Ash vs Evil Dead". Jack's serious and menacing nature could create some really funny and tense situations when contrasted with the more over - the - top and comical elements of that universe. Also, a crossover with a time - travel story could be interesting. Jack could be sent to different time periods and have to adapt to the different cultures and threats in each era.
One interesting plot could be Eyeless Jack protecting the baby reader from other dangerous entities in the fictional world. Maybe the baby has some special power that Jack is drawn to and he feels compelled to keep it safe.
One interesting eyeless jack fanfiction could be about his origin story. Maybe it delves into how he became the character he is, with details about his past life and what led to his transformation. Another could be a story where he forms an unlikely alliance with other characters in the same fictional universe.
One idea could be that the reader is a new resident in a town known for strange disappearances. Eyeless Jack starts to lurk around the reader's house, leaving small, disturbing signs. Eventually, the reader discovers Jack's lair while exploring an abandoned building. Another could be that the reader is a doctor or nurse, and Eyeless Jack, in his strange way, becomes attracted to the reader's medical knowledge and calmness during dangerous situations.
One idea could be that their baby grows up with a love for the sea, just like their parents' fateful encounter on the Titanic. Maybe the baby discovers a hidden diary that details their parents' story and becomes inspired to preserve the memory of the Titanic in a new way, like through art or historical research.
One idea could be that Eyeless Jack somehow enters the wizarding world of Harry Potter. Maybe he is drawn there by the powerful magic. He could initially be seen as a threat, but then he teams up with Harry Potter to fight a common enemy, like a new dark wizard who is using some sort of dark and forbidden magic that Eyeless Jack has knowledge of.
One idea could be that they team up to take on a common enemy in a post - apocalyptic world. Their relationship starts off rocky but as they face challenges together, they develop a deeper bond. Maybe Eyeless Jack has some hidden powers that Jeff discovers during their battles.
One interesting Eyeless Jack lemon fanfiction could be one where the author delves deep into his character backstory while also exploring a romantic relationship. It might show how his past traumas affect his interactions in the relationship. For example, his inhuman nature could create unique challenges and moments of tenderness.
In the fanfiction, Jack and Arcee could be magically merged into one being for a short time, and during that time, they create a new form of life. They then have to deal with the consequences of this unexpected creation and learn to be parents to this new being.