Who could be the antagonist in 'Harry Potter saved by good Lockhart fanfiction'?

In such a fanfiction, perhaps Lockhart manages to overcome his usual self - centeredness. He could use his knowledge of various spells, which he often brags about but fails to execute properly in the original books. Maybe he finally remembers the correct incantation at a crucial moment to save Harry from a dark wizard or a dangerous magical creature. For example, if Harry is being attacked by a basilisk, Lockhart might remember the spell to stun it and save Harry just in time.

The main antagonist could still be Voldemort. After all, he is the main source of danger for Harry in the original series. L would then be pitted against Voldemort's dark magic and his army of Death Eaters. L would have to use his wits and any new abilities he might have in this fanfic to outmaneuver Voldemort and keep Harry safe.

Another possibility is a group of Death Eaters who have broken away from Voldemort's control and formed their own faction. They see Harry as a symbol of the old regime that they want to overthrow. They target Harry, but his parents, with their knowledge of the old ways and their love for Harry, are able to save him from this group's attacks.

It could be Draco Malfoy. He might be jealous of Harry getting the teaching position and try to undermine him at every turn. Malfoy could spread rumors about Harry not being qualified or try to disrupt his classes in some devious ways.

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 Voldemort. He might have cast a new spell on Harry that makes him cough blood as part of his ongoing attempts to defeat Harry.