Well, obviously Naruto and Hinata are the main characters. Naruto is the protagonist with his strong will and determination. Hinata, in this case, is the one with an evil turn, which makes her a central figure as well.
Obviously Naruto would be one of the main characters. There might also be his friends like Sasuke and Sakura, but they could be portrayed differently since Naruto is 'evil' in this fanfiction. Maybe there are also some original characters created specifically for this fanfic that are related to the gaming aspect, like a mysterious game master who is manipulating Naruto's actions.
Well, Naruto is obviously one of the main characters. But there could also be other characters like Sasuke. Sasuke might be either an ally or an adversary to Naruto's 'evil genius' plans. He could be trying to stop Naruto if he thinks Naruto has gone too far into the 'evil' territory, or he could be working with Naruto for some mutual, albeit more self - interested, goals.
Obviously Naruto himself is a main character. He's usually at the center of the story as he's the one dealing with the influence of the Evil God. Sasuke is also often involved, maybe as a rival or an ally depending on the plot. Sakura might be there too, trying to help Naruto or deal with the chaos the Evil God brings.
Naruto's Rasengan could be used in interesting ways. For example, if he combines it with the Resident Evil knowledge of bio - energy, he might be able to create a Rasengan that can destroy the mutated cells of the bio - weapons more effectively. And for characters like Chris Redfield, his combat skills and experience with firearms could be enhanced by learning some basic ninja moves from the Naruto characters, like how to move stealthily.
Often, it portrays a very strained relationship. Naruto is likely to be confused and hurt by his mother's evil actions. He may try to reason with her at first, believing that there is still good in her.
One interesting concept could be an exploration of Naruto's dark side. It might show how his experiences could have turned him truly evil, like if he had been more influenced by the hatred in the ninja world from the start. Maybe in this fanfiction, he uses his powers for self - gain rather than for the good of the village.
The characters' abilities can be combined in various ways. For example, a Naruto character could use their chakra to enhance the physical strength of a Resident Evil character. So, if Leon Kennedy was given some chakra by a Naruto ninja, he could become even more powerful in combat. Also, a Resident Evil character's knowledge of weapons and survival skills could be used to help Naruto characters in the Resident Evil world. For instance, Ada Wong could teach Naruto characters how to use guns more effectively. In terms of the harem, a female character's charm or intelligence from either world could be used to influence the group dynamics. A Resident Evil girl could use her scientific knowledge to help Naruto characters understand the viruses better, and in return, they could teach her about chakra.
The Ancient Spirits of Evil in Naruto fanfiction could be tied to ancient jutsu or forbidden arts. Perhaps they were once experimented on by long - dead ninja clans, and now their presence is being felt again. They might have the ability to corrupt the minds of those they come into contact with, turning even good - hearted ninja to do their bidding.