Who could be the main antagonist in 'Harry Potter knows kung fu' fanfiction?

It could be a powerful wizard from Asia who has long studied both magic and kung fu. This wizard has decided to pass on his knowledge to Harry Potter, seeing his potential.

One interesting concept could be how Harry uses kung fu to defend Hogwarts. Maybe he combines magic with his kung fu moves, creating unique combat styles. For example, he could use a spell to enhance the power of his kung fu punches.

Well, maybe Harry Potter discovers an ancient magic that has ties to kung fu. He could start learning from a mysterious wizard who has mastered both magic and kung fu skills. He'd use his newfound kung fu moves along with his magic in battles against dark wizards.

A human hunter could be the main antagonist. He has a grudge against all kung fu animals, especially wolves. He believes they are too powerful and dangerous. He hunts them down one by one and when he hears about the wolf OC in the Valley of Peace, he sets his sights on the valley, causing chaos and danger for all the inhabitants, including the wolf OC and his new friends.

Perhaps a long - lost relative of the Potter family who feels they were unjustly excluded from inheriting the manor. This relative could be jealous of Harry's status and the wealth associated with the manor. They might use dark magic to try and claim what they think is rightfully theirs, leading to a battle of magic and loyalty within the Potter family and among Harry's friends.

Maybe there could be a new antagonist, a dark shapeshifter who is jealous of Harry's power. This antagonist could be an old wizard who has been in hiding for centuries, waiting for the right time to emerge and take over the wizarding world. He sees Harry as a threat to his plans and tries to eliminate him.

Another possibility is a corrupted member of the Ministry of Magic. They might be trying to use Harry as a scapegoat to gain more power within the Ministry. They could be working with the Death Eaters or acting on their own, but they would be a significant obstacle for Harry as he tries to stay alive and free while on the run.

Perhaps a new dark wizard or witch who has infiltrated the Ministry of Magic and made sure Harry was sent to Azkaban. This antagonist could be working towards a bigger plan to take over the wizarding world and sees Harry as a major threat even when he's locked up.

It could be Voldemort. He might see Harry's new waterbending ability as a threat and try to find a way to counter it. Maybe he would seek out dark magic related to fire to oppose Harry's water powers.

It could be a new dark wizard who has risen to power. This wizard might see Harry as a threat to his plans, so he manipulates the situation to get Harry exiled.