Well, it might be a fanfic that takes the concept of life being a game and applies it to the Naruto world. So, the ninja characters could be leveling up, gaining new skills in a game - like system. For example, Naruto could be on a journey to reach the 'highest level' of ninja, with each mission or fight being a step in that game - like progression.
Most likely Naruto himself would be one of the main characters. He is the central figure in the Naruto universe, so it's natural for him to play a big role in the fanfic. Sasuke is also probably a main character as he is Naruto's rival and an important part of the story. Sakura could also be there, as she is often part of Naruto and Sasuke's storylines.
Since it's a Naruto fanfic, Naruto himself is likely to be one of the main characters. He could be the protagonist who navigates this 'game - like' Naruto world.
One interesting plotline could be how the characters' real - life relationships are affected by the game. For example, Naruto might struggle with friendships in the game that mirror his real - life challenges. Another could be the power - ups and new abilities the characters gain within the game world, which they then use to overcome challenges both in the game and in their Naruto - like real - life situations.
It could be Orochimaru. In this fanfic, he could be a player of the same 'life - game' as Naruto, but with a much more sinister goal. He might be trying to manipulate the game rules to his advantage, like finding a way to make all the ninja in Konoha his puppets. Naruto would then have to figure out how to stop Orochimaru's evil plans within the game - like mechanics of his world.
One possible interesting plot could be Naruto finding out that the 'game' has hidden quests related to his family's past. For example, he discovers a quest that leads him to learn more about his mother's clan and the special powers they held. This could add a whole new layer to his character development as he tries to master these newfound abilities within the game - like framework of his life.
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.
A 'Dragon Ball Life is a Game' fanfic might explore how the characters interact with the game - like elements. Maybe Goku would approach battles with the same enthusiasm he has in the regular series, but now there are in - game quests and rewards. This could lead to new storylines where he has to complete certain tasks to unlock new abilities.
No. Naruto is a popular anime and manga aimed at a wide range of audiences, including children and teenagers. Fanfic that involves sexual content is inappropriate and goes against the spirit of the original work. It also violates the ethical and moral standards of the fandom.
One idea could be to create a story where the ninjas from Naruto are inserted into the political intrigue of Westeros. For example, Naruto, with his strong sense of justice, could find himself in the middle of the power struggle for the Iron Throne. He might try to use his ninja skills to bring peace to the war - torn land, much like he did in the Hidden Leaf Village.