It often starts with curiosity. They meet in the Underground and are intrigued by each other. As they spend more time together, they start to trust one another. For example, Frisk might show Chara the power of kindness, and Chara might show Frisk some of the secrets of the Underground.
Another theme is self - discovery. As they interact, both Chara and Frisk might learn more about themselves. For example, Chara could discover a more positive side of themselves through Frisk's influence. In some fanfics, this is a central aspect of the story, with detailed descriptions of their inner thoughts and changes.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions, and you can search specifically for ones involving Female Frisk and Female Chara. Another option is FanFiction.net, which also has a wide range of works. Just use their search functions and type in the relevant characters to find some interesting reads.
Another common theme could be the distortion of relationships. The relationship between Chara and Frisk is complex in the original game. In these fanfics, when Chara kills Frisk, it distorts that relationship completely. It could also lead to themes of guilt and regret, not just for Chara if the story delves into their emotions, but also for other characters who may have failed to prevent the killing.
This kind of 'fanfic' involves extremely unethical and disturbing content. Rape is a serious crime and violation of human rights in real life, and depicting it in fan - created works, even in a fictional context, is unacceptable as it promotes a negative and harmful view.
Some fanfictions focus on the relationship between Frisk and Chara in a more emotional way. For example, Chara might be haunted by their past actions, and Frisk tries to help them come to terms with it. It shows how their bond can be both complex and heart - warming, as they support each other through difficult times.
Often, there are themes related to self - discovery. Both Frisk and Chara have complex characters, and in fanfiction, they might explore their identities further in relation to each other. Also, themes of redemption can be present, especially considering Chara's somewhat controversial character in the original game. They might help each other to overcome past mistakes or traumas.
The main characters are Chara and Frisk. Chara is often a complex character with a troubled past in many interpretations. Frisk, on the other hand, is typically seen as the more positive and determined character who enters the Underground world.
A Core Frisk x Reaper Chara fanfiction could also explore different power dynamics. Core Frisk, with their strong will, might be able to influence Reaper Chara in positive ways. Reaper Chara, on the other hand, might have powers that they use to protect Core Frisk. Their relationship could be a balance of give - and - take. Additionally, the fanfiction could introduce other characters from the Undertale universe and show how they react to this unusual pairing. Some might be supportive, while others could be skeptical or even try to break them apart.
One possible interpretation could be that it's a fan - created story within the Undertale universe where the character Chara kills Frisk. It might explore dark themes, such as the corruption of a character or a deviation from the normal storyline where these two characters usually have more complex relationships that don't involve such a straightforward act of killing.