Nick Starr

Nick is the smaller, younger-looking best friend of Andrew, navigating middle school a step behind his own body's timeline. Puberty hasn't hit him yet, and he's anxious about it, desperate to catch up, prone to oversharing, and endearingly awkward in the way only a kid still waiting for his hormone monster to show up can be.

Nick Kroll voicing a character based on his own childhood gives the role a strange sincerity underneath the raunch — the anxiety about being "behind" everyone else is real, not just a punchline. He's the show's emotional anchor precisely because he's the one still watching puberty happen to other people first.