| Ayo Edebiri (voice Missy Foreman-Greenwald) (Halfshell) |
| Andrew Rannells (voice of Matthew MacDell) (Halfshell) |
| Fred Armisen (Elliot Birch) (Halfshell) |
| Jason Mantzoukas (voice of Jay Bilzerian) (Halfshell) |
| Jenny Slate (voice Missy Foreman-Greenwald) (Halfshell) |
| Jessi Klein (voice of Jessi Glaser) (Halfshell) |
| Jordan Peele (voice of Ghost of Duke Ellington) (Halfshell) |
| Maya Rudolph (voice of Connie the Hormone Monstress; Diane Birch) (Halfshell) |
| Nick Kroll (voice of Nick Birch; various characters) (Halfshell) |