Well, sometimes there are plotlines where ponies from different generations of My Little Pony enter the death battle. For example, the classic ponies from the old series might face off against the modern ones. This can lead to some really cool comparisons of their powers, looks, and personalities. Also, there could be a plotline where a pony has to fight an evil version of itself, which is always a great source of internal conflict.
Well, a great plotline might be a werewolf pony that was once a normal pony but got cursed. This pony then has to find a way to break the curse while dealing with the prejudice from other ponies who are scared of werewolves. Or perhaps a story where a werewolf pony falls in love with a regular pony, and they have to overcome the obstacles of their different natures and the disapproval of the pony community.
One possible plotline could be Twilight turning evil due to a dark magic spell gone wrong. She might start to oppose her friends and try to take over Equestria with her newfound dark powers.
Well, some plotlines might involve the ponies' adventures related to the secrets in Ponyville. For example, they might go on a quest to find the origin of a mysterious secret that has been passed down for generations. It could also be about how a new pony in town accidentally stumbles upon a secret club in Ponyville and has to prove herself worthy to be part of it or keep the secret safe.
In some fanfictions, Trixie might initially be up to her old tricks of showing off, but then she and Twilight get into a situation where they have to rely on each other. For example, they could be trapped in an enchanted forest and have to work together to find their way out. Trixie could use her showmanship skills to distract dangerous creatures while Twilight uses her book - smart magic to find the exit.
One interesting MLP fanfiction related to 'watch death battle' could be where the ponies from Equestria somehow end up observing a death battle in another dimension. They might react with shock and horror, or perhaps some of the more adventurous ponies could try to interfere. Another could be a story where they are forced to watch a death battle as a form of threat to their own world.
One popular storyline is seeing how different My Little Pony characters would fare in a Death Battle against various opponents. For example, Twilight Sparkle vs. a powerful magic - user from another series.
One possible plotline could be about Celestia and Luna having a friendly competition that turns into a learning experience for both of them. Maybe they compete in a magical ability showdown and in the process, discover new aspects of their own powers and each other's personalities.
In the world of My Little Pony Death Battle fanfiction, Applejack is popular too. Her strength and no - nonsense attitude can be great in a fight. Also, characters like Princess Celestia and Princess Luna are often used. Their regal status and powerful magic abilities put them in the spotlight in many death battle stories. They can be the ultimate opponents or the ones that the other ponies look to for guidance during the battles.
Another plotline could be a death battle where a character from RWBY has to fight an alternate version of themselves. It would be a psychological and physical battle as they grapple with their own strengths and weaknesses in a different form.
Some concepts include the exploration of new places. Humans in Equestria would likely be curious about all the different regions, like Canterlot or Ponyville. They would experience the unique landscapes and climates. There's also the concept of how humans are perceived in Equestria. Are they seen as strange or exotic? And how do they fit into the social hierarchy? Do they have to abide by the same rules as ponies? It's all very fascinating to think about.