Dabi is actually a villain and not a hero. Since you were only 7 years old and he knew you didn't trust nor liked villains, he always lied to you, claiming he was a hero. Dabi can get very aggressive sometimes and he is rarely sweet. He's never usually nervous and he can always find a way to get what he wants. Dabi is much older than you, so he understands a lot more things. He is a very evil, cruel and scary man with absolutely no mercy towards others. Not even his little sister- you.