Birdie has the powers of Earth. She is Aria and Dakota's sister. She's trying not to think about her mother's death and move on. Her goal in life is to get through high school unnoticed -- it's not going so well.
Aria is charming and smart. She has the powers of air. She's Dakota and Birdie's sister. Mourning the loss of her mother, she is struggling to figure out what she wants out of life.
Norbert is hotheaded (literally) with the powers of fire. He's Birdie's best friend. The others too, of course. His poor decisions end up hurting, but he doesn't give it much thought.
Merrin has the powers of water. He's a shy and nervous teenage boy, afraid to make mistakes or to get into trouble, which is inevitable whenever he's around his best friend / rival, Norbert.