Even Hinata could potentially be written as a betrayer in some really out - there fanfictions. Maybe in a crossover where there are mind - control elements, Hinata could be forced to turn against Naruto. But this would be a very different take on her character as she's usually portrayed as extremely loyal to Naruto.
Well, obviously Naruto himself is the central character. Sasuke could be involved as he has a complex relationship with Naruto. In a crossover, if Naruto is betrayed and ends up in the Dragon Ball universe, Vegeta might be a character he interacts with. Vegeta could initially see Naruto as a weakling but later come to respect his skills. Another character could be Luffy from One Piece. If Naruto is betrayed and crosses over to the One Piece world, Luffy would likely befriend him and help him out, seeing Naruto's situation as similar to his own crewmates' struggles.
In fanfiction, the idea of Naruto being betrayed by Wonder Woman could stem from a misalignment of their values. Maybe in this fictional scenario, Wonder Woman is from a different dimension and has different ideas about justice. She might see Naruto's methods as too chaotic and decides to turn against him. However, this is all in the realm of creative fan - made stories.
Often, in Naruto is Betrayed Crossover Fanfiction, Naruto is betrayed by someone close, like Sasuke. Then he might cross over into the Harry Potter universe. There, he could discover new magical abilities similar to his chakra control. He might use his ninja skills to help in the fight against Voldemort. Maybe the wizards initially distrust him because of his different powers, but he gradually earns their respect as he battles the dark forces. Also, he could learn magic and combine it with his ninja techniques to become even more powerful.
He could be betrayed by a false friend in the DxD world who spreads lies about him. For instance, telling others that Naruto has a hidden agenda to take over their realm.
One idea could be a crossover with Star Wars Rebels. Ahsoka could be betrayed by someone she thought was an ally in the fight against the Empire. Maybe a new character who was secretly working for Thrawn all along. This would lead to a complex plot where Ahsoka has to not only survive but also figure out who she can trust again.
One common theme is misunderstanding. Natsu is often misjudged by his friends, leading to a sense of betrayal. For example, his actions might be misinterpreted due to some magic interference or the scheming of a villain.
First, you need to decide on the crossover universe. If it's with another Star Wars era, research that era thoroughly. For example, if it's the Old Republic, understand the politics, the different species, and the Force - using orders. Then, plan the betrayal carefully. It should be something that makes sense for the character of Ahsoka. For instance, it could be a betrayal of trust based on a misunderstanding or a character's hidden agenda. Next, develop Ahsoka's reaction. Will she be angry, sad, or more determined? Write her internal monologues to show her emotions. Also, think about how the two universes will interact after the betrayal. Will there be new alliances formed? Finally, don't forget to add some action and adventure to keep the readers engaged.
In a more complex scenario, Naruto could be influenced by an outside force. Let's say an enemy of Konoha uses mind - control or some form of manipulation on Naruto. They make him believe that the ANBU is the enemy of the village and that he needs to take them down. As he betrays the ANBU, he slowly starts to realize that he's been used, but by then he's already in too deep and has to find a way to fix the situation and regain the trust of his friends and the village.