Suggestions by @giacomooffredi

Whisper The Wolf

as Cristina Vee in New voices for the actors

Cynder The Dragon

as Cristina Vee in New voices for the actors

Scarecrow

as Derek Stephen Prince in New voices for the actors

Lord Voldemort

as Mark Hamill in New voices for the actors

Emperor Sheev Palpatine (Darth Sidious)

as Mark Hamill in New voices for the actors

Mr. Smee

as Mark Hamill in New voices for the actors

Green Goblin (Norman Osborn)

as Mark Hamill in New voices for the actors

Ghetsis

as Mark Hamill in New voices for the actors

Sableye

as Richard Steven Horvitz in New voices for the actors

Scratch

as Richard Steven Horvitz in New voices for the actors

Bean the Dynamite

as Richard Steven Horvitz in New voices for the actors

Gengar

as Richard Steven Horvitz in New voices for the actors

King Boo

as Richard Steven Horvitz in New voices for the actors

Dr. Eggman (Adventures of Sonic the Hedgehog)

as Patrick Seitz in New voices for the actors

Coconuts

as Zeno Robinson in New voices for the actors

Grounder

as Travis Willingham in New voices for the actors

Scratch

as Derek Stephen Prince in New voices for the actors

The Riddler (Edward Nigma)

as Derek Stephen Prince in New voices for the actors

Rocket Raccoon

as Derek Stephen Prince in New voices for the actors

Rocky Roll

as Derek Stephen Prince in New voices for the actors