Apparently she's hot, too? Everyone I know says that. :I
You're not alone Dipu, I first thought Toph was a dude when I first saw Mac's theme.
Then I found out she was a girl and I literally facepalmed. I did watch a bit of Avatar: The Last Airbender when I was younger but I never watched The Legend of Korra. It's because I don't have cable television lol.