Answer:
I think it's Voldemort
Step-by-step explanation:
Voldemort is the villain who plays in Harry Potter. I think his backstory doesn't give him an excuse to what he became. He got orphaned at a young age like many others and allegedly couldn't love anything or anyone. But as he grew older, he became more evil and started using dark magic. His ultimate fear was death and believed in the deathly hallows. He killed lots of people without mercy, without have a second thought just to accomplish this. And he killed Harry's parents and tried to kill Harry at the age of 1 and failed. But ever since then, Harry was targeted each year at Hogwarts by him.