Lavagirl is the main character. She is played by Taylor Dooley.
Lavagirl is a young warrior who protects Planet Drool. Lavagirl can turn into lava and control lava. Lavagirl is unknown of her identity. Lavagirl had her own Lava Bike. Lavagirl can sometimes have a explosive temper, but normally she is nice and can control her temper. Lavagirl eats lava rocks. Lavagirl is also Sharkboy's girlfriend, sidekick, and best friend. Lavagirl could burn anything, she touches or sits on.