Caitlin Grafton

Caitlin Grafton turns up in the world of Big Mouth as one more kid caught in the chaos of adolescence, navigating friendships, awkwardness, and the show's frank, hormone-driven humor. She reads as curious and a little unsettled, feeling out her place among classmates whose bodies and feelings are all suddenly unpredictable.

Jenny Slate brings her usual specificity to the role, finding the anxious comic rhythms underneath a kid trying to keep up. Big Mouth's writing thrives on turning embarrassment into empathy, and even a smaller character benefits from that generosity, landing jokes that double as recognizable, uncomfortable truths about growing up.