Suggestions by @kyunkyunpaws

T.J. Miller

as The Protagonist in The Worst Movie Ever!

Kristen Schaal

as Tiawa in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

CaseOh

as Bisonorus in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Rachelle Heger

as Reedling in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Alejandro Saab

as Riff in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Tom Kenny

as Spunge in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Stephen Fu

as Congle in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Patrick Seitz

as Drummidary in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Cherami Leigh

as Edamimi in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Kellen Goff

as Maw in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Austin Lee Matthews

as Tring in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Sean Chiplock

as Krillby in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Michael Sinterniklaas

as Clamble in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Erica Mendez

as Candelavra in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Jack Black

as Entbrat in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Zeno Robinson

as Scaratar in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Dawn M. Bennett

as Barrb in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Valeria Rodriguez

as Thumpies (Female) in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Keith Silverstein

as Thumpies (Male) in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)

Ariana Grande

as Yelmut in If My Singing Monsters: Dawn of Fire Had A Voice Cast (English)