Suggestions by @jesselee

King of Hearts

as King of Hearts in Bunsen Is a Beast

Mario (Nintendo Character)

as Super Mario in Bunsen Is a Beast

King Koopa

as King Koopa in Bunsen Is a Beast

King Kong

as King Kong in Bunsen Is a Beast

King Bowser Koopa Sr.

as Bowser in Bunsen Is a Beast

The Prince

as The Prince in Bunsen Is a Beast

Yosemite Sam

as Yosemite Sam in Bunsen Is a Beast

Elmer Fudd

as Elmer Fudd in Bunsen Is a Beast

Old Iron Face

as Old Iron Face in Bunsen Is a Beast

Green Ghosts

as Green Ghosts in Bunsen Is a Beast

Werewolf

as Werewolf in Bunsen Is a Beast

KA.R.E.N. the Computer Wife

as KA.R.E.N. the Computer Wife in Bunsen Is a Beast

Cinderella (Disney Character)

as Cinderella in Bunsen Is a Beast

Snow White (Disney character)

as Snow White in Bunsen Is a Beast

Prince Charming

as Prince Charming in Bunsen Is a Beast

Nosferatu

as Nosferatu in Bunsen Is a Beast

DoodleBob

as DoodleBob in Bunsen Is a Beast

Dirty Bubble

as Dirty Bubble in Bunsen Is a Beast

Sheldon J. Plankton

as Plankton in Bunsen Is a Beast

Madame Hydra/Viper

as Madame Viper / Hydra in Bunsen Is a Beast