Mavis

Mavis turns up as one of the countless faces populating the crowded future of New New York, one of the small, quickly sketched roles that give Futurama's world its sense of a whole city bustling on beyond the main cast. She appears, does her bit, and moves on, part of the show's dense background texture rather than its foreground.

The pleasure here is Tress MacNeille's versatility rather than any single arc: she's one of the vocal chameleons who populate Futurama's edges with distinct, funny little voices, turning a walk-on into something specific and alive. Characters like Mavis are why the show's world feels inhabited even when nobody's watching.