Growth is also a common theme. Frisk may grow in confidence and strength under Undyne's influence, while Undyne might become more understanding and less hot - headed because of Frisk. And of course, there's the theme of adventure. Since they are in the Underground world which is full of mysteries, many fanfictions have them going on adventures together, facing monsters and solving puzzles.
Common themes include redemption and acceptance. Undyne may have to accept Frisk's non - violent ways, and Frisk may help Undyne see a different side of things, which is a form of redemption for her more violent tendencies. Additionally, loyalty is often explored. As their relationship develops, they show loyalty to each other in the face of various threats and challenges in the Underground.
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.
Another one is 'Frisk and Undyne's Adventure'. This story focuses on their adventures outside of the typical Underground scenarios. They go on a journey together and discover new things about each other and the world around them. It has a lot of fun and light - hearted moments as well as some deeper, more meaningful exchanges between the two characters.
One common theme is friendship. Since they are different characters in the Underswap, exploring how they become friends is popular.
One common theme is the friendship - to - romance development. Since they are both strong - willed characters in the game, seeing how their relationship might transition from comradeship to something more romantic is popular. For example, a story might start with them training together and gradually realizing they have deeper feelings.
Another theme could be adventure - related. Since they are both characters from the game Undertale which has an adventure - based storyline. They might go on adventures together in the fanfiction, facing challenges and growing closer as a result. Maybe they team up to save the Underground from a new threat or something similar.
One common theme is friendship. Papyrus and Undyne are often shown building a strong bond of friendship through various adventures or just daily interactions in the Underground. Another theme is mutual respect. They both recognize each other's strengths, like Papyrus admires Undyne's fighting skills and Undyne respects Papyrus's determination.
Overcoming challenges is also a big theme. Maybe there are challenges in their relationship due to differences in their nature (Undyne being a tough warrior and the reader perhaps being more timid). Or they might face external challenges like threats from other characters in the Undertale world, and they have to work together to overcome them and in the process, their relationship deepens.
Common themes include self - discovery. The male reader may start off not knowing much about himself or his place in the Underground, and through his relationship with Undyne, he learns more about who he is. Also, loyalty is a big theme. Undyne is a very loyal character, and the male reader has to prove his loyalty to her in many fictions. Additionally, there's the theme of protection. Undyne is a protector in the Underground, and in the fanfictions, she often tries to protect the male reader, and he may also try to protect her in return.
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.