Who could be the main antagonist in 'harry goes to hell and back fanfiction'?
The main antagonist could be the Devil himself. He might see Harry as an intruder in his domain and try to keep him there forever. He could set up all kinds of traps and challenges for Harry to overcome.
Perhaps the main antagonist is a corrupted version of Harry himself. When Harry enters Hell, his own dark side is amplified and it takes on a life of its own. This dark Harry tries to prevent the real Harry from leaving Hell as it wants to stay and rule over the dark realm.
It could be a powerful dark wizard who has made Hell his lair. This wizard might have a vendetta against Harry and wants to use the opportunity of Harry being in Hell to finish him off once and for all. He might control the dark forces and creatures in Hell to stop Harry from escaping.
Who could be the main antagonist in a 'Harry Potter goes back in time' evil fanfiction?
Another possibility is that an evil wizard from the past, who was previously defeated, gets resurrected or empowered by Harry's time - traveling interference. This wizard could then become the main antagonist, using Harry's actions to their advantage and wreaking havoc on the wizarding world.
Who could be the main antagonist in 'Sasuke goes back in time fanfiction'?
It could be a time - traveling version of Orochimaru. He might have his own plans for the past and Sasuke's interference could put them at risk. So, he tries to stop Sasuke from changing the past in a way that would undermine his future goals.
Who could be the main antagonist in 'itachi goes back in time fanfiction'?
It could be Danzo. In the original story, Danzo was a major factor in the Uchiha massacre. If Itachi goes back in time, Danzo would likely still be plotting against the Uchiha. His thirst for power and his extreme methods would put him at odds with Itachi's new attempts to save the clan.
Who could be the main antagonist in 'natsu goes back in time fanfiction'?
It could be Zeref. If Natsu goes back in time, Zeref might have different plans or be in a more powerful position at that time. He could be the main obstacle for Natsu to overcome, especially if Natsu is trying to change things related to the dark magic that Zeref wields.
Who could be the main antagonist in 'barry goes back in time fanfiction'?
It could be a time - traveling version of one of his existing villains. For example, Zoom could have found a way to travel back in time and is trying to change history to make his own future more powerful. Another option is that a new character, a time - keeper type of villain, emerges. This villain's goal is to stop Barry from messing with the timeline and will do anything to preserve the original course of history, even if it means harming Barry.
Who could be the main antagonist in 'Elena goes back in time fanfiction'?
It could be a powerful sorcerer from the time she travels back to. This sorcerer might sense that Elena doesn't belong in that time and wants to stop her from interfering with his plans. Maybe he has some dark magic he wants to use to take over the kingdom or town she's in.
Who could be the main antagonist in 'kenichi goes back in time fanfiction'?
Perhaps an ancient martial arts master who has gone astray. He might envy Kenichi's pure heart for martial arts and tries to corrupt him. This antagonist could use his deep knowledge of ancient martial arts against Kenichi, creating intense battles between them. Also, he might try to use Kenichi to gain more power in his own time period.
Who could be the main antagonist in 'jiraiya goes back in time fanfiction'?
Maybe the main antagonist could be an older version of Madara Uchiha who has somehow found a way to manipulate time as well. He might be trying to change the past in a way that benefits him and his grand plan for the ninja world, which would put him in direct conflict with Jiraiya.
Who could be the main antagonist in 'Harry goes to Ouran fanfiction'?
There might be a character who is secretly from the wizarding world but has turned to the dark side. This character could be after Harry in the Ouran setting, trying to use the chaos of the new environment to their advantage to get to Harry without being noticed by the Hogwarts professors.
Who could be the main antagonist in 'harry goes missing fanfiction'?
It could be a new dark wizard that we haven't seen in the original series. This wizard might be jealous of Harry's fame and power and wants to eliminate him by making him disappear.