Who could be the main antagonist in 'the weasleys try to take the potter fortune fanfic'?

Well, perhaps in this fanfic, the Weasleys might be in a financial bind and see Potter's fortune as a way out. Maybe they start with small schemes like trying to influence Harry to invest in Weasley - run businesses. But as it goes on, it could lead to more devious attempts that strain their relationship with Harry.

It could also be some external force that is manipulating Harry into believing the Weasleys are his enemies. For example, a dark wizard who wants to create chaos in the wizarding world by turning Harry against his friends. In this case, that dark wizard would be the main antagonist even though Harry is the one carrying out the revenge actions.

It could be a rogue Death Eater who decides to carry on Voldemort's legacy in a more extreme way. This Death Eater might have some new and terrifying dark magic up their sleeve.

Another possibility is that the wizarding legal system or a corrupt official within it could be the main antagonist. They might be trying to make things difficult for Harry, or perhaps they are in cahoots with the Weasleys and are trying to cover up the Weasleys' misdeeds. This would add an interesting layer of complexity to the fanfic.

In some cases, it could be that the magic system itself is the antagonist. For example, if there are ancient magical laws or curses that are affecting Harry's judgment and making him act against the Weasleys. The fanfic could then be about how they all fight against the constraints of this magic system to reconcile.

The main antagonist could be a powerful necromancer who combines the dark arts of Skyrim with some elements of Voldemort - like magic. He could be raising an army of the undead and causing chaos across Skyrim, which Harry has to stop.

It could be a new dark wizard who has a vendetta against Harry. This wizard might use a spell to stop Harry from eating, thinking it will weaken him before a final showdown. He could be someone who was once a follower of Voldemort and now wants to take his place and prove himself by getting rid of Harry.

Maybe an ancient evil spirit that was once bound but is now trying to break free by using the summoner as a conduit. This spirit could be manipulating events from the shadows, causing chaos in the wizarding world to draw the summoner out.

Perhaps an ancient spirit that has been awakened by the imbalance in the life - death cycle due to Harry becoming the Master of Death. This spirit sees Harry as the cause of the chaos and tries to destroy him to restore the balance in a way that is harmful to the wizarding world.

In an alternate dimension, the main antagonist could be a dark entity that has emerged from the very fabric of the dementions themselves. This entity could be using the Dementors as its minions, controlling them to do its bidding. It would be a powerful and mysterious foe, and Harry would have to discover its true nature and weaknesses in order to defeat it.