It's the Soul that need a surgery...
Carrie Woodsman, an alien who is sent to spy on humans. She is currently living in a comfy tree house at the forest in Gravity falls. She often hangs out with dipper and mabel and her gang. She works part time at the diner as a waitress so she could earn money to buy food (just cuz your an alien doesn't mean you can't die of hunger) and clothes.|
she is a fun loving person and would often be described as crazy due to her bubbly and random personality.
But whenever there is an Eclipse she would turn into her Alien form and dance in the around the small bonfire (it's a ritual in her home planet) and would sing the songs of her people.