A super smart moth who is the daughter of the legendary Mothra. While her mother travels the world fighting evil kaiju, Sylvie lives at home with her father.

She's a straight-A grad student and is studying to be a doctor. When she isn't studying, she's hanging out with Dee, Dooey, and all their friends. Though she's very shy, she really opens up around her friends. She's really nerdy and enjoys anime and card games. She's BFF's with Poupon and the two have brunch together every Sunday.

She's sort of conflicted at the thought of possibly becoming a kaiju herself, one day.