Dark Version of Harry Potter

He is neither kind nor warm-blooded, and can even be said to be cold-blooded and evil. He is also cruel, good at using power and tactics, and does not compromise on means to achieve his goals. He is good at disguise and likes to hide behind the scenes to control the dark forces in the world. His greatest pleasure is to fight with pigs and eat tigers. He plays with the world and charms everyone, but never gives his sincerity. It was such a person who actually traveled through time and became the savior of the wizarding world - Harry Potter! How will the wizarding world undergo earth-shaking changes because of him?