The relationships between the Task Force members could also be different. If a fanfic focuses on their personal lives more, they might become closer or more divided depending on how their backstories and personalities are explored. For example, Matsuda, who is often seen as the more naive member, could be shown in a more complex light, which might change how the others in the Task Force interact with him.
Misa and Light's relationship might also change. In certain fanfics, Misa could be more assertive in her relationship with Light, which could lead to a shift in their power dynamic. Light, who is used to being in control, might have to adapt to this new Misa.
Some relationships might seem stronger in fanfiction. For example, the bond between Lelouch and his sister Nunnally could be intensified in certain fanfictions. This could make the characters themselves more aware of the potential depth of their relationships.
Well, Merlin and Arthur's relationship could become more complex in their view. If the fanfiction shows a deeper emotional bond between them than what they thought was there, it could make them re - evaluate their friendship.
Ariel and Ursula's relationship could be seen in a new light. If the fanfiction shows Ursula having a more sympathetic backstory, Ariel might start to feel a bit of pity for her, which could change their dynamic from pure antagonism. Prince Eric's relationship with Ariel might also be affected. If the fanfiction has a different version of how they met or fell in love, it could either strengthen or weaken their bond in the eyes of the viewers, and the characters themselves might start to question their relationship.
The relationships among the Heathers characters would be in flux when watching the musical fanfiction. Heather Chandler might see any deviation from her perceived 'right' portrayal as an attack on her leadership, and she could lash out at the others, thinking they had something to do with it. Heather Duke might try to use the fanfiction to her advantage, perhaps to undermine Heather Chandler if it shows her in a bad light, which would create more tension between them. Heather McNamara might be caught in the middle, trying to keep the peace while also dealing with her own feelings about how she is portrayed in the fanfiction. Veronica, who is on the outskirts of the Heathers' group, might use the fanfiction as a way to further distance herself from them if it shows their toxicity in a new light.
Well, they could also be a bit annoyed if the fanfiction misrepresents them completely. L, for instance, might not like it if the fanfic makes him seem too foolish or out of character. He's all about logic and precision, so a bad portrayal could irk him. And then there are characters like Misa who might be flattered by the attention in the fanfictions, seeing it as a form of adoration for her character.
On the other hand, if a fanfiction creates some sort of false or negative scenario between them, it could cause some strain in their relationship. For instance, if a fanfiction wrongly implies that one character has betrayed another, there could be initial tension until they figure out it's just a fictional account.
Well, in some fanfics, Sasuke and Naruto could be brothers instead of rivals. This would completely change their dynamic, with them growing up together and supporting each other from the start. Their goals might also be more aligned, perhaps aiming to protect Konoha together in a more unified way.
It can make Light less of a cold - blooded killer. Maybe in a 'change of pace' scenario, he starts to question his actions more. For example, he might see the families of the people he kills and feel some remorse. This changes his character from the calculating and somewhat emotionless Kira in the original to someone with more depth and internal conflict. Ryuk, on the other hand, could become more involved in human affairs. Instead of just being an observer, he might start to manipulate events to see how humans will react. Misa could also change. She might become more independent and less blindly in love with Light, realizing that his actions are not as noble as she once thought.
Naruto's personality could become more brooding. Having the power of the Death Note might make him more aware of the darker side of power. He might not be as open and friendly as he usually is, since he has this secret and rather sinister tool at his disposal.
Ryuk would probably just be amused. He is a Shinigami who has seen a lot in his existence. Fanfiction is just another strange human creation to him. He might chuckle at some of the more outlandish ideas in the fanfictions, like a character having superpowers beyond the Death Note.