One popular plot twist could be a character who is seemingly under the influence of Kyouka Suigetsu but is actually faking it to deceive the enemy. This adds an element of mystery and deception to the story.
A great plot twist might be if Naruto somehow gains the ability to counteract Kyouka Suigetsu's illusions in an unexpected way. Maybe through his strong will and the power of the Nine - Tails. For example, the Nine - Tails' chakra could create a sort of shield against the illusions, which would completely change the dynamic in a battle or a situation where the Suigetsu's power is being used against him. This would also show Naruto's growth and his unique abilities in a new light.
One way is through character interactions. For example, if a character from Naruto's world gets trapped in an illusion created by Kyouka Suigetsu. This forces them to adapt and find ways to break free, which can lead to interesting dynamics as they learn about the power of Kyouka Suigetsu.
Another plot twist could be a Sharingan user losing their eyesight but then gaining Byakugan - like abilities in a new way. Maybe through some experimental jutsu or a strange encounter. This would force them to adapt to a whole new way of seeing and fighting, and it would also create interesting interactions with other characters who are used to their old abilities.
One popular plot twist could be a shared enemy that forces the Naruto and Bleach characters in the harem to work together more closely. For example, a powerful new villain that has the ability to nullify both ninjutsu and reiatsu, making the characters rely on their combined wits and skills. Another might be a love triangle between a Naruto character, a Bleach character, and a new character created specifically for the fanfic. This adds drama and tension to the harem dynamic.
One popular plot twist could be Naruto preventing the Uchiha massacre. This would completely change the future as Sasuke's path of revenge would be derailed. It would also impact the relationship between the Uchiha and the rest of the village.
A great plot twist could be that Naruto's transformation into a female gives her new jutsu abilities. Since in the Naruto universe, male and female ninjas can have different natural affinities. As a female, she might discover a hidden water - style affinity that was suppressed when she was male. This would change her fighting style and how she is perceived in battles. And in terms of the plot, it could lead to new alliances or rivalries.
One popular plot twist could be that the reincarnation of the god gives Naruto powers that are completely unexpected. For example, he might gain the ability to control time, which is a power not seen in the original series. This would change the whole dynamic of his battles and relationships.
Another interesting plot twist might be that Indra's reincarnation has memories of all his past lives from the very beginning. This would give the character an unprecedented advantage. They could use the knowledge of ancient jutsu and strategies that were long forgotten. It could also lead to a moral dilemma as the character has to decide whether to follow the same path as Indra did in the past or break free from the cycle of hatred.
A common plot twist is when a seemingly weak character turns out to be the true master of one of the swords. They've been hiding their power all along and suddenly reveal it when the situation is dire.
A popular plot twist could be that the Fem Susanoo is actually an ancient being reincarnated, and Naruto is the key to her remembering her past life. This changes their relationship from just an odd pairing to something deeply connected to the history of the ninja world.
One popular plot twist could be Naruto using his immortality to learn and adapt Gundam technology in ways no one expected. For example, he might infuse chakra into the Gundam's systems, giving it an edge in battles. Another could be a Gundam pilot having a connection to Naruto's world through some ancient relic, leading to a crossover of their powers and knowledge.