Perhaps in the fanfiction, Doctor Strange loses his ability to control the multiverse due to some unforeseen event. This forces the Avengers to step in and find a way to fix it. They might have to enter strange and dangerous universes, and along the way, they discover that the real threat is not what they initially thought, which is a classic and exciting plot twist.
Well, a great plot twist could be that the Scarlet Witch in the fanfiction has a completely different origin story related to the Multiverse. Maybe she discovers that her powers were not a result of the Mind Stone experiments but something much more sinister from another universe. This would change her relationship with the Avengers and how they view her powers.
Some characters might be in awe. For instance, Thor could be excited to see different versions of himself and his friends. He might see a version of himself that is even more powerful or a version of Loki that is actually good, and it would be a shock but also a source of amusement for him.
Well, one of the most interesting plot twists could be a character that was thought to be on the side of the humans actually being a secret agent for the Titans all along. This would completely change the dynamic of the story and the relationships between the characters.
Another common plot is the Avengers having to fix a multiverse - level threat. Maybe there's a villain who is jumping between universes, causing chaos, and the Avengers have to use their combined skills and knowledge of different universes to stop them. It's exciting because it involves different versions of the characters and different settings from various universes.
Perhaps the character is reborn with memories of a future event that threatens the Mikaelsons. This would put them in a position to either try to change the future or use it to their advantage within the family dynamics. They might face disbelief from the Mikaelsons at first, but as events start to unfold as they remembered, they gain more influence.
One idea could be exploring alternate versions of the main characters. For example, a version of Doctor Strange who turned to the dark side in another universe. Another plot could involve a love story between two characters from different universes that was not possible in the main MCU timeline. Or perhaps a story where the multiverse is collapsing and the characters have to find a way to stop it by traveling through various strange and dangerous universes.
In some fanfics, a plot twist could be that Severus was actually protecting Hermione all along under Dumbledore's secret orders, and Sirius discovers this and has to re - evaluate his hatred for Severus. This completely changes the dynamic between the three.
One interesting plot twist could be that Naruto starts to have memories of Tobirama's past battles. This would make him question his own identity and purpose. Another could be that Tobirama's reincarnation in Naruto causes a shift in the power dynamics among the villages. It might make other villages see Konoha as a greater threat or as a source of new knowledge.
One of the most interesting plot twists could be that Naruto discovers a new form of chakra that has the power to rewrite history. This would completely change the power dynamics in the Naruto universe.
One interesting plot twist is that the chakra seal on Naruto is actually a key to an ancient power source. At first, it seems like a hindrance, but as the story progresses, it's revealed that the seal was placed there to protect this power until Naruto was ready. This flips the whole concept of the chakra seal from a negative to a positive in an unexpected way. Also, there could be a plot twist where the sealing of Naruto's chakra was a misdirect, and it was actually someone else's chakra that was being targeted, and Naruto was just a decoy.
In 'Frozen Bonds', the plot twist is that the Snow Queen has been manipulating events all along not for evil, but to protect Emma from a greater threat that she is unaware of. This flips the typical villain - hero perception on its head and makes for a really unique and thought - provoking story.