Guaranteed Characters
Wario-Jim Cummings (Pete voice)
Waluigi-Tom Kenny or Carlos Alazraqui (Ice King/Mr. Crocker voice)
Bowser Jr.-Nancy Cartwright (Bart Simpson voice)
Larry-James Arnold Taylor (Wooldoor Sockbat voice)
Morton-Kevin Michael Richardson (Joker voice)
Wendy-Tara Strong (Harley Quinn voice)
Iggy-Rob Paulson (Yakko Warner voice)
Roy-Jeff Bennett (Cool Jimmy voice)
Lemmy-Dee Bradly Baker (PS1 Carnage voice)
Ludwig-Jess Harnell (Wakko Warner voice)
Spinoff film characters
King Boo-Mark Hamill (Undergrowth voice)
King K. Rool-Clancy Brown (Mr. Krabs voice)
Krusha-Tom Kenny (Scoutmaster Lumpus voice)
Klump-Bill Fagerbakke (Patrick Star voice)
Might Never Appear But
King Wart-Ian McKellen
Smithy-James Earl Jones (Darth Vader voice)
Fawful-Richard Horvitz (Zim Voice)
Count Bleck-James Woods or David Tennant
O'Chunks-Patrick Warburton
Mimi-Grey Delisle (FOP's Tootie voice)
Natasha-Kari Wahlgren (Shandra Jimenez voice)
Dimentio-Alan Tudyk (Turbo voice)
Francis-Dee Bradley Baker (Bubble Bass voice)
