There are the giants. They are the antagonists in the story. Each giant has its own characteristics, like being big and strong but also a bit dumb at times which Jack uses to his advantage.
Friendship or an unlikely alliance is often a theme. Despite their differences, they might find common ground and form a bond. This can lead to interesting character development as they learn from each other. For example, they could be fighting against a common enemy or helping each other deal with their own internal struggles.
In 'Jack the Giant Killer' story, Jack is a brave young boy. He goes on a journey where he encounters giants. He uses his wits and courage to defeat these huge and often menacing giants. For example, he might find ways to outsmart them in their own lairs.
A prevalent theme is the idea of an unlikely partnership. Given their different natures, fanfics often play around with how they might come together, whether it's for mutual survival or some other strange reason. For instance, they might team up against a more powerful evil in their world. It also explores the power dynamics between them, as Jeff is more impulsive while Eyeless Jack is more calculating. Another theme is the psychological aspect of their relationship. How do their minds, which are both damaged in their own ways, interact? Do they find some sort of understanding or is it just a constant battle of wills? This is often explored in great detail in many 'eyeless jack x jeff the killer fanfic'.
Another key element is the exploration of their backstories. Understanding why Nina became a killer and what made Eyeless Jack into what he is, can give more meaning to their relationship in the fanfic. It helps to explain their actions and feelings towards each other, and how they might overcome their differences or be drawn together because of their similarities.
You can try looking on some fanfiction platforms like Archive of Our Own (AO3). They have a large collection of various fanfictions, and there's a good chance you'll find Jeff the Killer and Laughing Jack Yaoi fanfictions there. Just use the search function and type in the relevant tags.
The yaoi aspect adds a whole new layer. In a normal horror setting, their relationship would be just one of horror and chaos. But in yaoi fanfiction, there can be an exploration of emotions like love, lust, and jealousy. It's interesting to see how these emotions are portrayed within their dark and twisted personalities, and how they interact with each other in a romantic or sexual context, while still maintaining their horror elements.
There's a fanfic called 'Shadows of the Killers' in the 'eyeless jack x jeff the killer' genre. In this fic, they form an alliance of sorts to take on a common enemy in their creepy, fictional realm. It's quite interesting as it shows a side of them that's not often explored in other works. Also, 'Twisted Ties' is a fanfic that explores their relationship in a more psychological way, looking at how their messed - up minds might connect or clash.
Well, 'Forbidden Affair' is also a great 'nina the killer x eyeless jack fanfic'. It has a lot of in - depth character exploration. It makes you think about what could really draw these two characters together in such a dark and twisted world of theirs.