I think it's popular because it allows for a lot of creativity. Writers can play with different genres within the fanfiction. It could be a dark, angsty story or a story about finding hope and friendship in unlikely places. The unique relationship between Nightmare Sans and Cross Sans gives a lot of scope for different types of stories to be told.
The popularity might be due to the contrast between the two characters. People are drawn to the idea of seeing how a 'dark' character like Nightmare Sans and a more 'conflicted' character like Cross Sans interact. It creates a lot of room for interesting scenarios.
One aspect to consider in this fanfiction could be the unique dynamic between Nightmare Sans and Cross Sans. Their personalities are quite different. Nightmare Sans is often associated with negative emotions and a more menacing presence, while Cross Sans has his own complex backstory. In the fanfiction, they might interact in ways that explore themes of redemption, power struggles, or unexpected alliances.
Power dynamics is also a frequent theme. Nightmare Sans is often depicted as very powerful, and Cross Sans has his own set of powers. Fanfictions might explore how they use or abuse their powers in relation to each other. It could be a power struggle, or they could end up combining their powers for some greater purpose.
The plot also matters. It could be about their rivalry, or a journey towards understanding each other. For instance, a plot where they are forced to team up against a common enemy can be really engaging. This not only shows their individual strengths and weaknesses but also how they can complement each other in a way.
Well, in these fanfics, the combination of Nightmare Sans and Killer Sans allows for some really cool storylines. Their unique abilities and personalities can lead to intense battles, unexpected alliances, and deep emotional moments. Fans are drawn to seeing how these two interact and how their relationship can be developed in different ways. For example, some fanfics might show Killer Sans being influenced by Nightmare Sans in a way that changes his character arc, which is really fascinating to read.
You can try looking on Archive of Our Own (AO3). It has a large collection of fanfictions, and you're likely to find some great Cross Sans x Nightmare Sans fanfictions there. Just use the search function and type in the relevant tags.
One great Dream Sans x Nightmare Sans fanfiction is 'The Dual Existence'. It beautifully explores the complex relationship between them. The story dives deep into their opposing natures yet shows how they are also two sides of the same coin. It has some really well - written dialogue that gives a great insight into their characters.
One common theme is power. Both characters are quite powerful in their own right, and fanfictions often explore how their powers interact. Another is the idea of redemption or the lack thereof. Since they are not exactly 'good' characters, some stories might play with the concept of them finding a way to be better. And of course, there's the theme of their relationship, be it a partnership, a rivalry, or something in between.
One common theme is friendship. Since they are from different 'worlds' in the Undertale AU, their journey to become friends is often explored. Another theme is redemption. Sometimes Cross Sans might have a troubled past and Dream Sans helps him find a new path.
Yes, there are quite a few. You can check out some fanfiction platforms like Archive of Our Own. There you might find various stories exploring the relationship between Killer Sans and Nightmare Sans. Some might focus on their adventures together in the alternate universes of the Undertale fandom.
Yes, there are quite a few. You can start by looking on popular fanfic platforms like Archive of Our Own. Some fanfics in this pairing explore their complex relationship, often delving into their personalities and how they interact in different scenarios within the Undertale AU universe.