Who could be the main antagonist in a Harry Potter Teddy Time Travel Fanfiction?

It could be an ancient dark wizard who was trapped in a time - locked state but is now released due to the time - traveling disruptions caused by Harry and Teddy. This wizard might see them as threats to his own dark designs on the wizarding world and try to eliminate them.

It could be a dark wizard from the past who somehow senses that Harry and Teddy don't belong in that time and tries to use their presence for his own evil gains. Maybe he wants to steal their future knowledge to become even more powerful.

Voldemort could still be the antagonist even if they travel back in time. If they go back to a time when he was already active, like when he was at Hogwarts as Tom Riddle, he could oppose their attempts to change the future or disrupt his plans. He might sense their presence and try to eliminate them.

Voldemort could still be the main antagonist. Even if they travel back in time, his evil plans and his thirst for power would still be a major threat. He might sense something is amiss with Narcissa's behavior if she starts to act against him, and of course, he would see Harry as a huge threat regardless of the time period.

Another option is that the antagonist is an ancient magical being that has been awakened by Harry Peverell's time - traveling disruptions. This being, which was once in a slumber, now sees Harry as an intruder in the timeline and wants to restore the order of things by getting rid of him. It could have powers that are not well - known in the modern wizarding world, making it a very difficult enemy to defeat.

The main antagonist might be a corrupted Ministry of Magic official. They freeze Harry in time to prevent him from exposing their wrongdoings. This official could be working with some dark forces secretly. They might try to keep Harry frozen while they gain more power and influence in the wizarding world. Hermione and Ron would then have to fight against the Ministry's resources to free Harry and expose the truth.

Voldemort could still be a main villain. Imagine if Teddy and Harry travel back in time and Voldemort discovers their presence. He might see them as a threat to his plans and try to eliminate them. This would lead to a lot of dangerous encounters and battles.

Maybe it's a group within the Ministry of Magic who oppose Harry's influence on Teddy. They might see Harry as trying to groom Teddy to be his successor in some way and want to stop them from leaving together to prevent this.

Another idea is that they travel to a time just after the end of the First Wizarding War. There is chaos and rebuilding going on. Harry and Teddy could be on a mission to retrieve a powerful magical artifact that was lost during the war. Along the way, they meet survivors of the war and learn about the true cost of the conflict. Teddy, who has grown up in a post - Voldemort world, is deeply affected by the stories of those who lived through the dark times.

One possible antagonist could be a dark wizard from the past who somehow catches wind of Albus Severus' time - traveling and decides to use his knowledge of the future for his own evil purposes. Maybe a forgotten Death Eater who was thought to be dead but actually survived in hiding and now sees this as an opportunity to rise again.