Well, the relationship could start with Papyrus's passion for spaghetti. He could talk to the spaghetti as if it were a friend, sharing his day and dreams. Maybe he gives the spaghetti names based on how it looks, like 'Curly' or 'Longy'.
One characteristic is the strong focus on their brotherly relationship. Fanfics often show how Sans and Papyrus rely on each other, like in how Sans might be the more laid - back one while Papyrus is full of energy and enthusiasm, and they balance each other out. Another is the use of the unique Underground setting. It provides a backdrop for their adventures and interactions. For example, they might be dealing with other monsters while also strengthening their own bond.
Underswap Papyrus is an interesting character. In fanfiction with a reader, it often explores a unique relationship. The fanfictions might show his charming, kind and sometimes goofy side. It could be about an adventure where he and the reader go through challenges together, or just a slice - of - life story where they get to know each other better.
Papyrus might be initially shocked. He's used to Sans being more laid - back, so seeing him in a fight could be quite a surprise. His eyes would widen and he might gasp.
Well, in 'underfell sans x papyrus fanfiction', their relationship is a key aspect. It can vary greatly depending on the author's interpretation. Some may focus on the loyalty between them, despite the cruel environment of Underfell. Others might explore how their personalities clash or complement each other. For example, Sans' cynicism in Underfell might contrast with Papyrus' more naive side, creating interesting storylines and character developments.
There's also 'Swap Brothers' Bond'. This fanfic delves deep into the brotherly bond between Sans and Papyrus in the Underswap setting. It shows their daily adventures and how they support each other. The author does a great job of capturing the essence of their swapped selves, and it's full of humorous and touching scenes.
A popular sans x papyrus fanfic is 'Shared Skies'. It has a really interesting plot where they face a new threat together in the Underground and their bond grows stronger as a result. 'Soulful Bonds' is also a good read. It dives deep into their emotional connection and how their personalities complement each other. 'Brotherly Love' is a simple yet effective fanfic that just showcases the pure love and care they have for one another.
One popular trope is the 'fish out of water' scenario. The reader, often being from a different world or just not used to the Underswap universe, has to adapt, and Papyrus helps them. Another is the 'unlikely friendship/romance' trope, as Papyrus' exuberant personality might seem at odds with the reader at first.
One common theme is the exploration of an unlikely relationship. Since Papyrus is a very positive and friendly character and Chara has a more complex and somewhat controversial backstory in the Undertale universe, seeing how they interact and form a relationship is often explored. For example, some fanfictions might focus on Papyrus helping Chara to overcome their past traumas.
I really liked 'The Unlikely Bond'. In this fanfic, Papyrus and Chara start off as enemies but gradually come to understand each other. The story has a lot of emotional depth, with Papyrus trying to see the good in Chara and Chara learning to open up. It's full of heartwarming moments and some really cool plot twists that keep you hooked.