Well, it's a rather strange concept. Naruto and Halo Marines are from two completely different universes. Naruto is all about ninjas, chakra, and village politics, while Halo Marines are in a science - fiction setting with advanced technology and alien battles. Combining them in a fanfic could be either really interesting if done well, or a complete mess. It depends on how the author manages to blend the two disparate elements together.
Power - hunger is a common theme. Bad guys in Naruto often seek more power, like Orochimaru always hunting for new jutsu and ways to be immortal. Another theme is revenge. For example, Sasuke's journey towards vengeance against Itachi was a big part of his villain - like arc in some fanfictions. Also, the idea of chaos and disrupting the established ninja order is often there, as seen with characters like Pain who wanted to make the world feel the pain to create a new order.
I'm not a person to be afraid in a Naruto fanfic, but generally, characters might be afraid of a 'big bad wolf' - like figure if it represents a great threat. In Naruto fanfic, it could be a new, powerful and malevolent villain that shares some characteristics of a big bad wolf, such as being predatory and dangerous. But it really depends on the specific plot and how the author writes it.
Well, some 'Naruto Bad Romance Fanfic' could focus on the relationship between Sasuke and Hinata. Imagine a story where Sasuke is forced into a relationship with Hinata due to some political reasons in the shinobi world. This could create a lot of drama and tension as Sasuke is still dealing with his past and Hinata has her own feelings for Naruto. It would be an interesting exploration of a 'bad' romance in the Naruto setting.
Well, it can divide the fan community. Some traditional fans who love the original Naruto might not like this new 'bad boy' concept. But on the other hand, it can attract new fans who are interested in this different take on the character.
One interesting 'naruto bad guy fanfiction' could be 'The Ascent of Orochimaru'. It delves deep into Orochimaru's backstory and his motives in a really engaging way. It shows his journey from being a curious outcast in the ninja world to becoming one of the most feared villains. Another is 'The Redemption of Hidan'. This fanfic takes the wild and blood - thirsty Hidan and gives him a path to change, which is quite a unique take on his character.
No. Naruto characters are often brave and have faced many tough enemies. A 'big bad wolf' - like villain would just be another challenge for them to overcome.
The novel I recommend to you is "The Domineering Uchiha Weasel." Although the main character is Uchiha Weasel, Naruto is also an important character. In this novel, Naruto becomes a bad guy, and he is quite domineering! In this story, you can see how he befriended all kinds of experts and tried to make his way into the Jianghu. I hope you like this fairy's recommendation. Muah ~😗
Yes, it can be a common theme in some fanfiction. One reason might be that some authors want to explore different aspects of Naruto's character. They might think that showing him as a 'bad boy' can add an edgy or different dimension to his personality, making the story more interesting.