In the 'alphys chooses threader over undyne fanfic', it might be due to the plot developments. Perhaps Threader was there for Alphys at a crucial moment, while Undyne was preoccupied with other things. This led Alphys to gradually develop stronger feelings for Threader. Also, the author might have wanted to create a different dynamic and show that Alphys can be attracted to someone other than the obvious choice of Undyne.
Threader in this fanfic is probably a character that the author has crafted to be an alternative to Undyne for Alphys. They might be a character who has a different set of values, interests or a way of interacting with Alphys. It's possible that Threader is a more introverted or intellectual character compared to the more action - oriented Undyne, and Alphys finds this contrast appealing. However, until we actually read the fanfic, we can't be certain about the exact nature of Threader.
One common theme is friendship turning into love. They start as friends or acquaintances, and as the story progresses, they realize they have deeper feelings. For example, in many fics, they begin by collaborating on something, like a scientific experiment or a community project.
Well, it could be simply due to a different kind of chemistry. Sometimes in fanfiction, the author wants to explore an alternative relationship dynamic. Reyna has a certain allure and mystery about her that might attract Percy. And the story could be set up in such a way that Percy and Reyna have more shared experiences at a particular point in time, which makes him lean towards her instead of Annabeth.
One popular 'undyne x alphys fanfic' is 'Green Thumb'. It beautifully depicts their relationship development. The story shows how they overcome their individual insecurities and grow closer. It has some really sweet moments that fans of the pairing adore.
The theme of growth is often seen. Both characters grow as individuals within the relationship. Alphys may become more outgoing and Undyne may become more empathetic. Also, the theme of adventure in their relationship is present in some fanfictions, where they go on adventures together in the Underground, strengthening their bond along the way.
One possible reason could be that Karin has unique abilities that are more useful to Sasuke in his goals. For example, her sensing abilities might be crucial in his missions. Also, Karin has a deep loyalty towards Sasuke which he might value more than Sakura's feelings at that time.
One reason could be that Rachel represents a different world to Percy. She's more of an outsider to the demigod world, and Percy might be attracted to that sense of newness and freedom she seems to offer. Maybe he's tired of the constant danger and drama in the demigod life with Annabeth.
One reason could be Jacob's more down - to - earth nature. He represents a more normal, warm - hearted life compared to Edward's rather cold and sometimes brooding vampire existence. Bella might be drawn to the simplicity and closeness to nature that Jacob offers.
The contrast between their personalities. Undyne is bold and strong, while Alphys is shy and nerdy. This creates an interesting dynamic that writers like to explore in fanfiction.
Common themes include friendship - turned - love. They start as friends or colleagues in the Underground, and then their relationship blossoms into something more romantic. Also, there's the theme of support. For example, Undyne might support Alphys when she has problems with her scientific experiments or when she's feeling down about herself. And of course, the theme of discovery, as they discover new things about each other and about themselves through their relationship.