Meet The Big Mouth Voice Actors You Didn't Know
- 01. Who provides the voices behind Big Mouth?
- 02. Core Big Mouth voice actors
- 03. Recurring supporting characters and their actors
- 04. Guest stars and celebrity cameos
- 05. How the voice actors shape the show's tone
- 06. Evolution of the Big Mouth cast over seasons
- 07. Notable character-voice actor pairings
Who provides the voices behind Big Mouth?
The Big Mouth voice actors are led by real-life comedians Nick Kroll and John Mulaney, who voice the show's two main teenagers, Nick Birch and Andrew Glouberman. Kroll also doubles as the Hormone Monsters Maury and Rick, while Maya Rudolph plays Connie, Jessi Glaser's Hormone Monstress, offering one of the most recognizable voices in the series. Together, this small but versatile core cast uses improvisation and character doubling to create more than 40 distinct roles across seasons, giving Big Mouth a dense, yet highly personal, vocal fingerprint.
Core Big Mouth voice actors
The Big Mouth main cast centers on a handful of multi-hyphenate comedians who handle multiple roles per episode. Nick Kroll voices Nick Birch, Maury the Hormone Monster, Rick, Coach Steve, Lola Skumpy, and several minor characters, often producing upwards of 40 separate voices by the later seasons. John Mulaney, best known for his stand-up and writing work on SNL and Inside Amy Schumer, focuses almost exclusively on Andrew Glouberman, Andrew's Hormone Monster, and various echo versions of the character as puberty escalates.
- Nick Kroll - Nick Birch, Maury, Rick, Coach Steve, Lola Skumpy, Dutch Twins.
- John Mulaney - Andrew Glouberman and his Hormone Monster.
- Maya Rudolph - Connie LaCienega (Jessi's Hormone Monstress) and Diane Birch.
- Jessi Klein - Jessi Glaser.
- Ayo Edebiri - Missy Foreman-Greenwald (from Season 4 onward).
Jenny Slate originated the role of Missy in Seasons 1-3 before stepping down in 2020 to allow a Black voice actor to take over the character, consistent with the show's stated commitment to representation. Ayo Edebiri, who later won a Primetime Emmy and Golden Globe for her work on The Bear, infused Missy with a more nuanced, grounded vocal tone that critics have praised for its authenticity.
Recurring supporting characters and their actors
Beyond the two leads, Big Mouth supporting characters are voiced by a rotating ensemble of comedy veterans and character actors. Jason Mantzoukas plays Jay Bilzerian, Andrew's hypersexual classmate, and several other randy, often shirtless side roles, contributing roughly 15 distinct voices across the eight-season run. Fred Armisen voices Nick's father, Elliot Birch, and appears in smaller roles tied to the Birch family's neuroses, drawing on his long career in sketch and alternative comedy.
Maya Rudolph's dual role as Connie and Diane Birch showcases her range, moving from the sultry, chaotic Hormone Monstress to the tightly wound, anxious mother figure. Other frequent performers include Jessi Klein as Jessi Glaser, whose dry, self-aware delivery anchors several emotional arcs, and Brandon Kyle Goodman as Walter, the queer lovebug who narrates the show's more progressive relationship and identity themes.
| Character | Role in Big Mouth | Primary Voice Actor | Seasons Featured |
|---|---|---|---|
| Nick Birch | Lead protagonist; late bloomer dealing with puberty | Nick Kroll | 1-8 |
| Andrew Glouberman | Nick's best friend; early bloomer with intense shame | John Mulaney | 1-8 |
| Missy Foreman-Greenwald | Shar-tongued, socially aware classmate | Jenny Slate (1-3), Ayo Edebiri (4-8) | 1-8 |
| Jessi Glaser | Introspective, often conflicted middle-schooler | Jessi Klein | 1-8 |
| Connie LaCienega | Jessi's Hormone Monstress; sensual, unpredictable | Maya Rudolph | 1-8 |
| Maury the Hormone Monster | Nick's Hormone Monster; chaotic libido | Nick Kroll | 1-8 |
Guest stars and celebrity cameos
In addition to its core Big Mouth ensemble cast, the show regularly features high-profile guest actors across its eight seasons. Season 5 alone introduces more than 25 celebrity voices, including Kristen Bell, Adam Scott as biology teacher Mr. Keating, and Keke Palmer in various adult-life cutaway roles. The series has also drawn in film and TV stars such as Lupita Nyong'o as the Kenyan Shame Wizard and Jordan Peele as Duke Ellington, the ghost who haunts Nick's attic.
Guest casting decisions are often tied to the episode's thematic arc; for example, comedians with improvisational backgrounds are frequently tapped for sex-ed or therapy scenes. By the final season, Big Mouth has cycled through more than 200 guest roles, giving the franchise a distinctly "Who's who?" texture without sacrificing the familiarity of its central cast.
How the voice actors shape the show's tone
The Big Mouth voice performances lean heavily on improvisation: the writers provide loose scripts and then allow actors to riff, creating awkward pauses, stammers, and bursts of vulgarity that mirror real adolescent embarrassment. Recording sessions are typically done solo or in small pairings, which lets performers modulate their tone from tender to ridiculous within a single take.
Executive producer Andrew Goldberg has noted that the show deliberately avoids "cartoonish" vocal choices, instead asking actors to under-play their lines so teenagers sound like real 13-year-olds, not Saturday-morning caricatures. This approach has helped the series maintain credibility even when depicting surreal concepts such as hormone monsters, lovebugs, and shame wizards.
Evolution of the Big Mouth cast over seasons
Since its debut in 2017, the Big Mouth cast roster has quietly shifted demographics and representation while keeping its comic core intact. Jenny Slate's departure from Missy in 2020 marked the most explicit on-record change, with the show's creators publicly stating that the role should be voiced by a Black actress moving forward.
Meanwhile, the number of recurring LGBTQ+ and neurodivergent characters has grown, backed by actors who bring lived experience to their vocal portrayals. Walter, the queer lovebug voiced by Brandon Kyle Goodman, has become a recurring explainer for consent and identity, reflecting the show's expansion from a puberty-focused comedy to a broader conversation about social and emotional development.
Notable character-voice actor pairings
- Maury the Hormone Monster - Voiced by Nick Kroll, Maury embodies unfiltered male desire and is often cited as the series' most quotable creation.
- Connie LaCienega - Maya Rudolph's Hormone Monstress blends R&B-style sass with vulnerability, earning her two Emmy Awards for voice-over performance.
- Walter the Lovebug - Brandon Kyle Goodman's calm, instructive tone grounds many of the show's sex-ed moments, making him a fan-favourite educator.
- Jay Bilzerian - Jason Mantzoukas' hyper-confident, slightly grotesque delivery heightens the absurdity of Jay's unrestrained libido.
- Duke Ellington - Jordan Peele's spectral narration adds a dry, existential layer to Nick's attic-based introspection.
These pairings demonstrate how the Big Mouth voice actors often extend beyond mimicry into character creation, using vocal texture, pacing, and emphasis to define personalities that feel distinct even when multiple roles are played by the same performer.
Helpful tips and tricks for The Big Mouth Voice Actors
Who voices the main characters in Big Mouth?
Nick Kroll voices Nick Birch and several supporting roles including Maury the Hormone Monster and Coach Steve, while John Mulaney voices Andrew Glouberman and his Hormone Monster. Jessi Klein plays Jessi Glaser, Maya Rudolph plays Connie LaCienega and Diane Birch, and Ayo Edebiri voices Missy Foreman-Greenwald from Season 4 onward.
Why did the voice actor for Missy change?
The show's creators replaced Jenny Slate with Ayo Edebiri in 2020 to ensure Missy, a Jewish-Black character, would be voiced by a Black actress, aligning on-screen representation with off-screen identity. Edebiri's casting was framed as part of a broader effort to improve the diversity of the Big Mouth voice cast without altering the core comedic tone.
Do the voice actors improvise on Big Mouth?
Yes: the Big Mouth writers and producers encourage extensive improvisation during recording sessions, allowing actors to riff around loose scripts and capture natural-sounding teenage awkwardness. This improvisational style has led to many of the show's most viral lines and character idiosyncrasies, especially in hormone-monster and therapy-center scenes.
How many distinct voices does Nick Kroll perform?
Across the series' run, Nick Kroll performs roughly 40 distinct vocal roles, ranging from Nick Birch and Maury to minor one-off figures like Coach Steve, Lola Skumpy, and assorted monster cohorts. This doubling allows the Big Mouth production to maintain a broad cast list while relying on a tight, core ensemble.
Are there any notable guest stars in Big Mouth?
Yes: over eight seasons, Big Mouth has featured more than 200 guest voice actors, including Kristen Bell, Adam Scott, Keke Palmer, Lupita Nyong'o, and Jordan Peele. These cameos often appear in specific thematic episodes, such as sex-ed classes, therapy sessions, or historical flashbacks, adding star power without distracting from the central teen narratives.