Merlin is the main character in this type of fanfiction. His pain could be related to his magic, his relationships, or his sense of duty. Then there's Arthur, who may be oblivious to Merlin's pain most of the time. There could also be other characters like the knights of Camelot. For instance, if Merlin is bullied or made to feel inferior by some of the knights, he would hide his pain from them. And Merlin's mother Hunith might also be a character, especially if the fanfiction delves into Merlin's past and the pain of being separated from her.
The main character is Merlin, of course. He is the focus as he is the one with the hidden pain. Arthur Pendragon is a key figure too. Since Merlin is Arthur's manservant, Arthur's actions, words, or even his ignorance of Merlin's true self can be sources of Merlin's pain. Sometimes, the Great Dragon can also be involved. The dragon might be aware of Merlin's pain and offer some cryptic advice that Merlin has to decipher while still hiding his pain from others.
One interesting plot could be Merlin hiding his pain from Arthur because he doesn't want to seem weak. He might endure the taunts of the knights in silence while secretly using his magic to heal his internal wounds. Another could be Merlin hiding his pain over his mother's absence or the fact that he has such a huge responsibility on his shoulders with his destiny to protect Arthur and Camelot.
The Soul Reapers could be involved too. Some of them might notice that Ichigo is acting strange and try to figure out what's going on. Captains like Byakuya or Kenpachi could potentially cross paths with Ichigo during this time. And then there are the Hollows. They might sense that something is different about Ichigo but not be able to fully understand why he seems weaker than before, which could lead to some interesting confrontations.
Luna Lovegood could be a character in such fanfiction. Given her unique perspective on things, she might have an interesting take on Snape's memory loss. She could offer some unorthodox solutions or just be a calming presence in the chaos that follows Snape's changed state. And of course, Dumbledore might be involved as he has always had a complex relationship with Snape and would surely be interested in how this memory loss affects Snape and the future of Hogwarts.
In a lot of these fanfictions, Luna Lovegood can be a key character. She has an open - minded and unique way of looking at things. So she might be the one who first suspects that Harry isn't really dead, or she could be part of the plan to help Harry fake his death and then communicate with him in some secret way while everyone else thinks he's gone.
Typically, Merlin is a central character. He's the one with the magic and the kind heart that can potentially break the curse. The Beast is another main character. This could be a character with a tragic past, like a prince who was cursed by an evil sorcerer. In addition, characters like Morgana might also make an appearance. She could either be a hindrance, trying to use the situation for her own gain, or a helper in some unexpected way.
Then there are characters like Lancelot who can be Merlin's loyal friend. He could be the one who stands by Merlin when his magic is discovered or when he is in trouble at school. These characters, with their different personalities, create a rich tapestry of relationships and storylines in Merlin high school fanfiction.
Obviously, Danny Phantom himself is the central character. His friends like Sam and Tucker are also often involved. They play important roles in how Danny deals with his revealed identity, either by providing support or getting into trouble because of it.
Obviously, Harry Potter is the main character as it's about him hiding his power. His friends, like Hermione Granger and Ron Weasley, are also likely to be main characters. They might be in the dark about his hidden power at first, which could create some interesting dynamics in their relationships.
In Gohan snaps fanfiction, Gohan is the main focus. However, antagonists can play a big role too. Characters like Cell or Frieza could be in the story, if it's set in an alternate universe or a what - if scenario. For example, if Frieza comes back and attacks his family again, that could be the reason for Gohan to snap. And then there are his friends who will support him, like Krillin and Tien.
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.