Well, a plot twist could be that Shiro's evil actions lead to the discovery of a hidden part of the game world. As she breaks rules and acts maliciously, she stumbles upon a secret area or a new type of game that no one knew existed. Or perhaps she teams up with an unlikely ally, an enemy from before, because of her new evil mindset, and together they uncover something that changes the whole understanding of the 'No Game No Life' world.
In an 'evil shiro no game no life fanfic', a plot twist might be that Shiro's evil is a result of a prophecy. She believes that she has to be evil to fulfill some grand plan for the world of games. So she starts acting against the other characters, but as the story progresses, it's revealed that the prophecy was misinterpreted. Another interesting plot twist could be that her evil actions cause a split in the game world, creating two parallel versions - one where she's good and one where she's evil, and then the story could be about how to merge these two worlds back together.
I'm not entirely sure which specific 'evil shiro no game no life fanfic' you are referring to. But generally, in such fanfics, the character Shiro might be portrayed in an 'evil' way which is a big deviation from her original character in 'No Game No Life'. This could involve her using her intelligence in more malicious ways, like tricking other characters not for the sake of the game but for personal gain or revenge. However, without reading the specific fanfic, it's hard to analyze it more deeply.
One possible plot twist could be that they can actually interfere in Naruto's life in some unexpected ways. For instance, they might find a way to physically manifest and help Naruto in a crucial battle.
Well, a plot twist might be that the character who seemed to be the weakest throughout the game turns out to be the mastermind behind everything and wins in a very unexpected way. Or perhaps the game is revealed to be a dream or a virtual simulation, and the real world has a completely different set of rules and consequences at the end of what was thought to be the 'game'.
One great fanfic could be 'The Adventure of Sora and Shiro'. It focuses on their journey through new virtual worlds, exploring their relationship further. The author beautifully depicts how they rely on each other's strengths.
I'm not sure specifically as there could be many different 'Shiro's Game Fanfics'. Generally, it might be about the characters in the game that Shiro is associated with, their adventures, relationships, and the events that unfold within the game world as reimagined by the fanfic writer.
Maybe the seventh swordsman has a secret power that is unleashed when Naruto is in a dire situation. This power could be something that was thought to be lost or forgotten in the Naruto world, and its appearance changes the entire dynamic of the story.
One possible plot twist could be that Danzo is actually being controlled by an even greater enemy. So, when Naruto is about to defeat him, he realizes that there's a bigger threat behind Danzo. Another could be that Danzo reveals a hidden power that he has been suppressing all along and suddenly becomes much stronger than Naruto expected.
Perhaps a plot twist in this fanfic is that the danger Bella is in was actually created by Thor himself, unknowingly. Maybe some of his past actions had consequences that put Bella in harm's way, and now he has to make up for it by saving her. Or it could be that the way Thor saves Bella changes her in some unexpected way. For example, she could gain some of his powers or a strange connection to his world that she has to deal with.
Maybe Naruto discovers that Matatabi has a hidden past that is linked to his own family. For example, his mother or father had a secret encounter with Matatabi before he was born, and this changes the way he views his family and his connection to Matatabi.
One possible plot twist could be that Naruto discovers Godzilla is being controlled by an evil force. So instead of just fighting Godzilla, he has to find a way to break the control. Another could be that Godzilla is actually a guardian of some sort, and Naruto misinterprets its actions as aggression at first. Then they end up teaming up against a greater threat.