Suggestions by @tzekuanng

Keith Silverstein

as Sorcerer in Gregory and Vanessa in Souls eyes demon

Jim Meskimen

as Scarecrow in Gregory and Vanessa in Souls eyes demon

Jena Rundus

as Ghost in Gregory and Vanessa in Souls eyes demon

Robin Atkin Downes

as Eye monster in Gregory and Vanessa in Souls eyes demon

Patrick Seitz

as Scorpion in Gregory and Vanessa in Souls eyes demon

Jason Griffith

as Good Boy in Gregory and Vanessa in Souls eyes demon

Creature Voice Effects

as Good Boy in Gregory and Vanessa in Souls eyes demon

Liam O'Brien

as Freak the grim reaper in Gregory and Vanessa in Souls eyes demon

Patton Oswalt

as Rat in Gregory and Vanessa in Souls eyes demon

Wanda Sykes

as Ursula Witch in Gregory and Vanessa in Souls eyes demon

Sean Chiplock

as Skeleton in Gregory and Vanessa in Souls eyes demon

Fred Tatasciore

as Charlie in Gregory and Vanessa in Souls eyes demon

Marta Svetek

as Gregory in Gregory and Vanessa in Souls eyes demon

Elizabeth Lail

as Vanessa in Gregory and Vanessa in Souls eyes demon

Katherine Langford

as Krasue in Gregory and Vanessa in Souls eyes demon

Marta Svetek

as Gregory in Gregory repairs shattered Glamrock Animatronics

Cameron Miller

as Monty in Gregory repairs shattered Glamrock Animatronics

Marta Svetek

as Roxy in Gregory repairs shattered Glamrock Animatronics

Keanu Reeves

as Glamrock Foxy in Gregory repairs shattered Glamrock Animatronics

Heather Masters

as Glamrock Chica in Gregory repairs shattered Glamrock Animatronics