Mario/Mickey Mouse

Cast:

 * Mario as Mickey Mouse (Mario and Mickey Mouse are both main characters)
 * Wario as Donald Duck (Wario and Donald Duck are both vain)
 * Donkey Kong as Goofy (Donkey Kong and Goofy are both clumsy and awesome)
 * Bowser as Pete (Bowser and Pete are both main villains)
 * Yoshi as Pluto
 * Peach as Minnie Mouse (both are girlfriends to Mario and Mickey)
 * Daisy as Daisy Duck (both share the name)
 * Red Toad as Huey
 * Blue Toad as Dewey
 * Green Toad as Louie
 * Toadette as Webbigail Vanderquack (from DuckTales)
 * Luigi as Scrooge McDuck (both have mansions)
 * Diddy Kong as Max Goof (both are little buddies to Donkey Kong and Goofy)
 * Waluigi as Mortimer Mouse (they're both mean, tall, and skinny)
 * Bowser Jr. as Pete Jr. (both are sons of Bowser and Pete)
 * Professor Elvin Gadd as Ludwig von Drake (they're both professors)
 * Boos and Luigi's Mansion Ghosts as the Lonesome Ghosts
 * II Piantassimo (from Super Mario Sunshine) as the Aracuan Bird (they're both crazy)