They are both primary antagonists, are final bosses, wear glasses, kidnap people (Princess Peach or Baby Luigi), have a method of flight (flying saucer thing or broomstick), power up bosses (by the ray gun or by magic), and can shrink things in some way (by the Vacuum Shroom or by magic). --DekuStick Master 21:00, April 26, 2011 (UTC)