I'm not entirely sure specifically what 'cross x error fanfic' is. It could potentially be a fan - created fictional work that involves some sort of 'cross' concept (maybe a crossover between different universes or characters) and an 'error' element which might refer to a mistake, glitch or some sort of abnormal situation within the story. However, without more context, it's difficult to be more precise.
Perhaps in a 'cross x error fanfic' that crosses over a high - school drama universe and a virtual reality game world. An error in the VR game system makes the high - school students get trapped in the game world. But there are glitches in the game world that make it different from what it should be. For example, the quests are all jumbled up and the characters' abilities are misaligned. The students have to use their knowledge from the high - school drama (like social skills and teamwork) to navigate through the error - filled game world and find a way to get out.
Well, Ink x Error fanfics often explore the complex relationship between these two characters. They might focus on their contrasting personalities. Ink, being the creative and somewhat chaotic one, and Error, who is more about destruction. In these fanfics, the authors usually create scenarios where they interact in ways not shown in the original canon. For example, they could be forced to team up against a common enemy, which leads to a slow - building understanding and perhaps even a strange form of friendship or more.
The theme of redemption also shows up often. Error, being the more 'evil' of the two in a sense, can be on a path of redemption through his relationship with Ink. Ink, in turn, might learn more about the importance of balance between creation and destruction. Additionally, there are fanfics that focus on the idea of them being two sides of the same coin, and how they can complete each other.
I'm not entirely sure specifically what 'error x fresh fanfic' is about without more context. It could potentially be a fan - created fictional work that involves some sort of 'error' and something 'fresh', perhaps a new take on a story or a unique combination of elements within a fanfic universe.
A popular Ink Sans x Error Sans fanfic is 'Shades of Their World'. In this fanfic, the author does an excellent job of exploring the different aspects of their personalities. Ink's chaotic but positive energy is contrasted with Error's more brooding and negative nature. It makes for a really engaging read as you watch their relationship develop. There's also 'Ink's Influence on Error'. This one shows how Ink's presence starts to change Error in unexpected ways. It's a short but sweet fanfic that leaves a lasting impression.
To find 'error x fresh fanfic', first, determine which fandom it might be related to. Then, go to the relevant fanfic communities or forums. Ask around if anyone has heard of it. Also, use search engines with the full phrase 'error x fresh fanfic' and see if any results pop up. You might need to dig a bit deeper if it's a relatively unknown work.
For Error, you could develop his character by showing his softer side when he's around Ink. Maybe he starts to care more about the things Ink creates instead of just wanting to destroy them. As for Ink, he could become more understanding of Error's glitches and not just see him as a nuisance. The lemon could be a factor in this development. For example, if the lemon has some sort of calming effect on Error, Ink could use that to his advantage to get closer to Error.
In 'cross sans x cross chara fanfic', a common theme is the exploration of the characters' backstories. Since both cross sans and cross chara have their own histories in the Undertale lore, fanfic writers might delve into these backstories to create more depth in their relationship. Another theme can be redemption. If either character has made mistakes in their past, the fic could focus on their journey towards redemption. And of course, there is always the theme of the relationship between the two characters, whether it's a platonic bond or something more complex that develops over the course of the story.
To write a great Error Sans x UnderSwap Sans fanfic, start with a strong concept. Maybe it's a story about how UnderSwap Sans tries to 'fix' Error Sans in some way. Research the existing fan works and the official Undertale lore to get inspiration. When it comes to the writing itself, build up the relationship between the two characters gradually. Show how they initially react to each other, and then how their relationship evolves over time. Use vivid descriptions for their actions and the settings around them. For example, describe how Error Sans' glitches affect the environment they are in, and how UnderSwap Sans' positive energy can sometimes counteract that. Also, make sure the pacing of the story is right, not too slow or too fast.