Maybe it's because her expression and situation touch people's hearts and make them relate.
The manga girl might be scared because of a sudden loud noise or an unexpected appearance of a scary character. Or perhaps she has a phobia that's been triggered.
Maybe it's because it evokes strong emotions and makes people sympathize with the girl's fear.
I think the scared black cartoon girl gets popular because she makes people curious. Her scared expression makes them want to know what's going on and that keeps them interested.
Maybe it's because it evokes a lot of emotions and makes people curious. It stands out and catches people's attention easily.
The expression and emotions of a scared shocked manga girl make her stand out. Her wide eyes, open mouth, and tense body language convey the intensity of her feelings.
Maybe the character had a bad experience with the girl before. As for living with his aunt, it could be that his parents aren't around or there's some other family situation.
Maybe she saw something creepy or had a bad dream.
Maybe she saw something spooky or had a bad dream.
Maybe there's a scary monster or a creepy scene that frightened her.
Maybe there's a creepy monster or a sudden loud noise that frightened her.
