These anime characters became villains due to circumstances beyond their control. Some were born into it, while others saw no other way to escape their current predicaments. Though these villains do inexcusably despicable deeds that will not be forgiven any time soon, many fans can see that these characters did not have any other choice.
Junpei Yoshino is a reserved high schooler who is mercilessly picked on by his peers in Jujutsu Kaisen. The bullying is so bad that Junpei is left with visible scars. Despite the severity of the attacks, his teachers turned a blind eye, leaving Junpei to fend for himself.
One day, while at a movie theater, Junpei sees his attackers acting out until a mysterious person distorts their heads, leaving them for dead. Curious about his power, Junpei follows him and becomes a student of the evil Mahito. Blinded by a want for revenge and power, Junpei gains his own Cursed Technique and seeks to use it on his attackers. Junpei saw no way out of his torture and felt that being Mahito's student was his only option.