Who could be the main antagonist in 'Harry binds a succubus familiar fanfiction'?

Well, it could be that Harry, in this fanfic, discovers a way to bind the succubus familiar through some ancient magic he stumbles upon. Maybe he needs its powers for a particular task, like fighting a new dark force in the wizarding world.

The main antagonist could be the Ministry of Magic if they view the succubus as a dangerous and uncontrollable creature. They might try to separate Harry from his familiar, and in the process, become the main force that Harry has to oppose.

One possible plot could be that Harry, perhaps in a search for power or knowledge, binds the succubus. But then he has to constantly battle her wiles and temptations as she tries to break free. He might use magic he's learned at Hogwarts to keep her in check.

Perhaps a group of anti - dragon fanatics within the wizarding world could be the main antagonists. They see the dragon as a dangerous and uncontrollable creature and will do anything to get rid of it, even if it means going against Harry.

It could be a powerful demon who wants to control the Succubus Queen and use her powers for evil. Since Naruto is with the Queen, he becomes a target too.

Well, perhaps the succubus could initially be a mystery to Harry. She might seem like an ordinary creature at first, but then he discovers her true nature. Maybe she helps him in some unexpected ways in his battles against Voldemort, like using her unique powers to distract the Death Eaters.

In a fanfiction, the relationship might develop in an unexpected way. Harry Potter, who is used to the more 'normal' magical creatures, meets the succubus familiar. At first, he might be repelled by her nature, but gradually he discovers that there is more to her. They could bond over shared experiences in the magical world, like facing a common enemy. However, the relationship would always be on shaky ground due to the succubus's reputation and her own powers that could be both a help and a hindrance.

Harry's character could become more cautious. Dealing with a succubus would make him realize that there are many dangerous and unpredictable forces in the magical world. He might also become more secretive as he doesn't want others to know about the succubus he has bound.

Obviously, Harry would be the main character as the title indicates his transformation into a succubus. His friends like Hermione and Ron are likely to be important secondary characters. They would play a role in either helping Harry come to terms with his new nature or being initially suspicious of the changes in him.

A power - hungry merman who wants to rule over all the mer - people. He sees Harry as a threat because Harry has some special powers or a claim to the throne that he doesn't want to share.