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.
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.
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.
There's a fanfiction called 'Sora and Shiro's Hidden Powers'. In this one, the author delves deeper into the untapped potential of Sora and Shiro. It shows them training to master new abilities that were only hinted at in the original series. It's really interesting to see how their characters develop further with these new powers.
Since I don't know the specific 'Shiro's Game Fanfic', it's hard to say for sure. But likely, Shiro is one of the main characters. There could also be other characters who are friends, allies, or enemies of Shiro in the game world.
Good 'no game no life sora and shiro fanfiction' often stays true to the characters. Sora's confident and strategic nature and Shiro's brilliant and introverted personality should be well - represented. For example, in a good fic, Sora would come up with elaborate plans and Shiro would be there to back him up with her computational skills.
One more theme could be growth. Shiro, with her already high intelligence, and Izuna with her own abilities, can grow both individually and in their relationship. For instance, they could learn from each other's strengths and weaknesses. In some fanfictions, there might also be a theme of discovery, as they explore new aspects of the 'No Game No Life' world together, which is full of strange rules and entities.
It could become more protective. Shiro might feel the need to look out for Sora more, since Sora in a female form might seem more vulnerable. For example, in dangerous game situations, Shiro would be more likely to step in front of Sora.
Sora and Shiro are step - siblings. They were loners in the real world. Sora was a NEET who was good at strategizing in various games. Shiro was a genius in math and logic. Together, they formed 「 」 (Blank). They were so good at games that they got bored with the real world's games. Then they received a mysterious challenge which led them to the world of Disboard.