Suggestions by @elkmane

Melissa McCarthy

as Susie in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Sunny Suljic

as Kris in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

J.K. Simmons

as Mad Dummy in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Terrence Malick

as WD Gaster in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

A Dog

as Annoying dog in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Glen Powell

as Mettaton in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Robert Pattinson

as Asgore in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Jacob Batalon

as Alphys in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Danai Gurira

as Undyne in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Kevin Hart

as Papyrus in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Jay-Z

as Sans in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Tom Cruise

as Flowey in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Beyoncé

as Toriel in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Mckenna Grace

as Frisk in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Myself

as Producer in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

David S. Goyer

as Composer in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Dean Norris

as Choreographer in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Anna Kendrick

as Writer in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Kendrick Lamar

as Writer in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)

Terrence Malick

as Director in Joss Whedon's Undertale: An Undertalian Story (Plus Deltarune Too)