First, they would likely be shocked by the sudden change in environment. In the Black Butler world, the scenery is a mix of beautiful mansions and dark alleys. They could befriend some of the characters, like Finny or Mey - Rin. But they would also need to watch out for the antagonists. Maybe they get caught up in a plot by the cults or other evil forces. And since it's a fanfiction world, there could be all sorts of unexpected twists that deviate from the original story, like a new type of demon emerging or a different backstory for Ciel.
Well, they might find themselves in a world full of Victorian - era charm and mystery. They could end up as a servant in the Phantomhive manor, having to deal with Sebastian's slyness and Ciel's demanding nature. Or perhaps they become a part of the underworld that the characters often interact with, facing all kinds of danger and intrigue.
Understand the social hierarchy. Since it's a Victorian - like setting, knowing your place and following the proper etiquette can keep you out of trouble. Also, be aware of the supernatural elements. Don't make deals with demons casually, and if you encounter other supernatural creatures, try to find out their weaknesses first. For example, some may be vulnerable to holy water or certain spells. Another important thing is to make allies. Befriend the servants in the Phantomhive manor, they are loyal and can be very helpful in difficult situations.
They might have various reactions. Some characters could be amused by the creative interpretations in the fanfiction. For example, Sebastian might find it interesting to see how fans perceive his relationship with Ciel in different ways.
If someone was transported into Avengers fanfiction, they would likely be amazed by the superpowers around them. They might be tempted to try and gain powers themselves. They could also get caught up in the internal conflicts of the Avengers, like the argument between Iron Man and Captain America in 'Civil War'. And they'd have to deal with the threat of villains such as Thanos, either by fighting or trying to find a diplomatic solution.
Well, they might find themselves in a world full of strange creatures like vampires, werewolves, and demons. They could end up joining a group of hunters to fight against the supernatural evil. Maybe they'd discover they have some latent supernatural powers themselves.
If Harry were transported into Naruto fanfiction, it would be a total culture shock for him at first. The ninja society is so different from the wizarding world. However, his determination and quick - thinking from dealing with Voldemort could make him a valuable ally. He might start to learn some ninja skills and combine them with his magic. For example, using Apparition along with a ninja's speed to surprise enemies. His magic could also be a great asset in healing, as some of his spells could potentially work on ninja injuries in this fictional crossover.
Well, he might be really confused at first. In a female - dominated world in fanfiction, Naruto would probably have to adapt to different social norms. Maybe he'd find that the fighting styles are different, or that the values placed on things like friendship and power have a different slant. He could also be a bit of an oddity, being a male in a world full of females.
In a pokemon fanfiction world, once transported there, you'd be immersed in a world where the rules of the Pokémon universe are sometimes bent or expanded. You might encounter Pokémon with unusual colors or powers. You could get involved in epic quests to save the Pokémon world from a new threat. There would also be opportunities to interact with well - known Pokémon characters from the original series in new and different ways, like forming unexpected alliances or rivalries.
They might have to adapt to the unique rules and powers in the DC Universe. For example, if it's a normal human from our world, they'd be shocked by the existence of superpowers like Superman's flight and strength. They could also get involved in the classic DC storylines, either as a helper or a disruptor.
Well, it could be really interesting. The OC might bring in new skills or a different perspective. Maybe they'd be a great fighter and help the group survive better, or perhaps they'd have some knowledge about a potential safe haven that no one else knew about.
Well, it could really change the whole story. The OC might introduce new powers or a different perspective. Maybe they'd side with the Rebels and help them in unexpected ways, like using some unique technology they brought with them from their own world.