Buffy. She wasn't just some superpowered woman in a suit. She was chosen for something she never wanted and had to hide it from her own family. She had to try and balance a normal life with school and eventually work, while still going out at night to protect Sunnydale and sometimes the entire world. And after her mother died, she had to take on bills, household duties, and raising her little sister while social services looked on.
She teaches girls that it's okay to mess up and that life can be overwhelming, but you just have to to pick yourself up and be stronger than whatever you're facing.