Well, in some of these fanfics, they often explore the dark and twisted relationship between Ben Drowned and Jeff the Killer. For example, there could be a story where they team up to haunt a particular place, bringing their own unique brand of horror to the setting.
Some fanfics might also put them in situations that test their limits. For instance, they could be trapped in a realm where they have to face their worst nightmares. This not only showcases their individual fears but also how they might react to each other in such extreme circumstances. It's these kinds of creative and often macabre scenarios that make these fanfics so engaging for some readers.
One interesting aspect in these fanfics can be the backstories they create for the characters. Maybe a fanfic delves into Ben Drowned's past before he became the entity he is, and how that might intersect with Jeff the Killer's own origin story. This can add a whole new layer of depth to their interactions.