Often, a plotline in such fanfiction is the human being captured for a ritual. The dark elves might think the human has some special essence or power that they can use in their dark magic rituals. The human, of course, resists this. Another aspect could be the relationship that develops between the human and a particular dark elf. Maybe they start off as captor and captive but gradually develop a strange friendship or even a romantic relationship, which is a very common trope in this kind of fanfiction.
One interesting plotline could be the protagonist's struggle to escape from the dark elves' lair while facing various traps and challenges they've set. Another might be the development of an unexpected alliance with a sympathetic dark elf who helps the captive navigate the complex social and political structure within the dark elf community.
Typically, the dark elves are shown as powerful. They have advanced magic skills that they use to capture and control the human. They may be seen as cruel, especially in the beginning when they first capture the human. But sometimes, they are also shown as having a complex moral code. So while they might be doing bad things like capturing the human, they might also have reasons like protecting their own kind or following an ancient prophecy.
One common theme is the clash of cultures. The human has their own set of values and beliefs, which are often very different from the elves'. This leads to misunderstandings and conflicts at first. For example, in many stories, the elves' reverence for nature may be something the human doesn't immediately understand.
One popular 'human captured by elves fanfiction' could be 'The Captive Human'. In this story, a human is captured by elves during a journey through a magical forest. The elves initially see the human as a strange and potentially dangerous intruder, but as the story progresses, they begin to understand the human's nature and a complex relationship develops between them.
Often, the main character is a human or some other non - dark elf race who gets captured. Then there are usually the dark elves themselves, with their leaders or powerful warriors being important characters. Maybe there's a dark elf princess or prince who has a role in the captive's fate.
One common plotline could be the human's struggle to adapt to their new dragon form. They might initially be frightened or confused by their new body and abilities. For example, they could have trouble flying or breathing fire at first. Another plotline could involve the human - now - dragon trying to find their place in the dragon society. They might face discrimination from other dragons who don't trust this 'newcomer' who was once human. Also, a plotline could be about the human - turned - dragon using their unique perspective (from being human) to solve problems in the dragon world, like coming up with new ways to defend the dragon territory or finding a solution to a food shortage problem.
Another plotline could be about the characters' self - discovery in a human world. They might have to figure out who they are without their vampire or werewolf identities. This could lead to interesting character development as they learn about their strengths and weaknesses as ordinary humans, and how they interact with the people around them in a more down - to - earth way.
One possible plotline could be the rescue mission of the captured Star Fox team. Maybe they are held captive by a new and powerful enemy, and their allies have to come up with a clever plan to break them out. Another could be the internal struggle of a captured member, dealing with isolation and the attempts of the captors to turn them against their team.
There may also be a plotline where Sam and Dark Danny form an unlikely alliance against a greater evil. Despite his dark nature, they realize that they need each other's strengths to defeat this new threat. This could lead to a gradual change in Dark Danny as he spends more time with Sam and is influenced by her positive qualities.
Perhaps Harry, being raised by house elves, has a very different view of the wizarding world's social hierarchy. He may see the unfair treatment of house elves as completely unacceptable from a young age and strive to change it. This could lead to him getting into conflicts with some of the more traditional pure - blood families who rely on house - elf labor.