The themes in mermaid fairy tail fanfiction are diverse. A very prevalent one is friendship. Mermaids form strong bonds with their fellow sea - dwellers or sometimes with humans they encounter. The struggle between good and evil is also common. Mermaids might have to fight against evil sea witches or other malevolent forces. Additionally, the theme of the beauty and mystery of the underwater world is often explored, as mermaids are part of this enchanting realm.
In the original Little Mermaid story, the mermaid doesn't cut her own tail. However, if we were to imagine a different version where she did, perhaps it could be a symbol of her extreme sacrifice. Maybe she was trying to fit into the human world in a very drastic way. But this is not part of the traditional narrative.
The mermaid elements can add a sense of wonder to their relationship. For example, if they are exploring an underwater mermaid kingdom together, it creates a unique and romantic setting. The mermaids' magic or their way of life might also be something that Natsu and Lucy bond over. Maybe they have to protect the mermaids, and this shared goal brings them closer.
One popular trope is the mermaid falling in love with a human. It's a classic. Another is the mermaid having a special power in her tail, like the ability to heal or control the sea. And of course, the mermaid being out of her element on land and having to adapt is also quite common.
You can try looking on fanfiction websites such as Archive of Our Own (AO3). It has a large collection of various fanfictions, and there's a good chance you'll find some mermaid - tail - related ones there. Another option is FanFiction.net, which also hosts a wide range of fan - created stories.
One common theme is the mermaid's relationship with the human world. This could involve a mermaid falling in love with a human and the challenges they face. Another theme is the mermaid's life underwater, like their family dynamics and their place in the mermaid society. Also, adventure themes are popular, such as the mermaid going on a quest to find a magical item or save their underwater kingdom.
Another great one is 'Dracula' by Bram Stoker. This novel introduced the iconic vampire Count Dracula. It combines elements of horror, mystery, and the Victorian era's fascination with the unknown. The story of Dracula's attempts to spread his vampiric influence in England is both thrilling and chilling.
Often, 'fin' at the end of a story is a kind of marker telling readers that the narrative has reached its finish. It's a straightforward and sometimes artistic way to signal the story's completion.