Fern’s speed comes from the fact that she’s not human. She’s a Sylph, a humanoid cryptid capable of modifying her own body density, which makes her ultra-fast when she’s ultra-light, and an incredible blocker when she’s ultra-heavy, since people slam into this skinny little slip of a girl, expecting to knock her out of the way, only to discover that they’ve actually run into an immovable object. It’s comedy gold every time.
