The Joker is often involved. He loves to push Batman to the brink of death in many fanfictions. His chaotic and unpredictable nature means he could come up with all sorts of devious plans to almost kill Batman, like luring him into a death - trap filled with his signature laughing gas. Another character is Ra's al Ghul. Since he has his own goals for Gotham and sees Batman as an obstacle at times, he might try to eliminate him in a more elaborate and long - planned way that leaves Batman on the verge of death.
There could also be the villains. Depending on the context of the fanfiction, it might be Dr. Eggman. He's always trying to cause trouble for Sonic and his friends, and he could be the one behind the situation where Tails almost dies. So Dr. Eggman would be a main character on the opposing side.
Batman is obviously one of the main characters. He's the central figure around which the tickling scenarios revolve. Robin is also commonly involved, as his relationship with Batman allows for different types of interactions, including tickle - related ones. The Joker is another character that might show up, as he loves to play mind games with Batman and tickling could be part of his devious plans.
Harry Potter himself is the key character in 'Harry is burned' fanfictions. But other characters like the Weasley family as a whole can be involved. Mrs. Weasley might take on a motherly role towards Harry, trying to nurse him back to health. And Fred and George could use their magical inventions to try and ease Harry's pain or discomfort from the burns.
Well, obviously Lance is a main character as he is the one being kidnapped. His friends, like Keith, Hunk, and Pidge, are often involved. They usually play the roles of the rescuers, using their unique skills to try and save Lance.
Sometimes other villains from the Batman Beyond universe might make appearances in the fanfiction related to Blight. They could either team up with Blight, adding more challenges for Batman, or they could be involved in some sort of power struggle within the criminal underworld that is affected by Blight's actions.
Obviously, Batman and Ace are the main characters. Batman is the hero who does the saving, and Ace is the one in need of rescue.
Obviously, Kushina herself is the central character. But often, Minato, her husband, is also involved. Since they are closely related, his actions and reactions to Kushina's time - traveling situation are important parts of the story. Naruto can also be a key character. If Kushina travels to a time when Naruto is already born or in the future, their interactions can be very emotional and drive the plot forward.
Well, obviously Draco Malfoy himself. Often, characters like Harry Potter, Hermione Granger, and Ron Weasley are involved too. Since they are the main protagonists in the original series, in fanfictions about Draco's arrest, they might play roles as witnesses, or even as his defenders or accusers depending on the plot.
Obviously, Naruto is the central character. His relationship with the Nine - Tailed Fox is the core of this kind of fanfiction. The Fox itself, which is a powerful and mysterious entity within Naruto's body, is also a key character.
Often, a plotline involves Batman being captured by a cult - like group. They might have some strange and deadly rituals. Batman, being held captive, is tortured and starved, and his body starts to give out. His only chance of survival is to outwit his captors and escape. This could involve using his knowledge of psychology to manipulate them or finding a weak link in their security. It also might lead to a character arc where Batman re - evaluates his methods and relationships with his enemies and allies after such a close brush with death.