One interesting fanfiction could be where Jeff the Killer somehow ends up in the Adventure Time universe and has to face off against Finn and Jake. Maybe he initially tries to cause chaos but then realizes that the magic and unique characters in Adventure Time are more than he can handle.
Well, in some fanfictions, he could be a new threat that emerges from a portal. The portal could be a result of some of the wacky experiments in the Adventure Time world. He might start causing mayhem and the heroes, like Finn and Jake, have to figure out how to stop him.
One interesting Jeff the Killer fanfic could be 'Jeff's Redemption'. It explores a different side of Jeff where he tries to resist his killer instincts. Another good one might be 'Jeff in a New World' which places him in a modern, urban setting with new challenges. And 'Jeff and the Haunted House' is also quite engaging as it involves Jeff dealing with supernatural elements in an old, spooky house.
One great Ticci Toby x Jeff the Killer fanfiction is 'The Unlikely Bond'. It explores their relationship in a really interesting way, showing how they might interact beyond their typical 'killer' personas. Another one could be 'A Different Path' which takes a more unique approach to their story, delving into their backstories and how that might bring them together. There's also 'Twisted Allies' which focuses on their partnership in a world full of chaos and danger.
One interesting Adventure Time Lich fanfiction could be one where the Lich is redeemed. Maybe he teams up with Finn and Jake to fight an even greater evil. This would be a cool twist as the Lich is usually the ultimate bad guy.
There might be a fanfiction where Gumbald gets transported to an alternate dimension. In this new world, he has to team up with his enemies from the Adventure Time world to survive. This could lead to some really interesting character development for him as he learns to see things from a different perspective. And also, a fanfiction could explore Gumbald's family history and how it influenced his actions in the show.
A different plotline could be set in an alternate universe where Jeff and Nina are not killers. They meet in a more normal setting, like a school or a small town. However, their dark pasts or tendencies start to surface, and they have to deal with how this affects their new - found relationship, all while trying to keep their true selves hidden from the people around them.
One interesting plot could be their unexpected alliance. Maybe they are forced to team up against a greater evil in the fanfic. This would create a lot of tension as they have their own issues with each other but have to put them aside for the common good.
One interesting aspect could be the exploration of Jeff's insanity in different scenarios. For example, how his madness affects his interactions with other characters in the fanfiction world. Maybe it shows how his deranged mind views his victims or how he copes with his own inner demons.
In 'jeff the killer baby fanfiction', the creativity in the plot twists can be really engaging. For example, the baby version of Jeff could have powers or abilities that are different from the original character. It could also play with the idea of how other characters in the Jeff the Killer universe interact with this new baby - like incarnation. They might be initially less threatened but then realize the true danger.
One possible plot could be that the protagonist in the fanfic is on a mission to stop Jeff the Killer from his killing sprees. They form an unlikely alliance with other characters who have also been affected by Jeff. They then engage in a series of cat - and - mouse games with Jeff, which is full of suspense and danger.