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 * The concept for Boo (pictured) was based on Takashi Tezuka's wife, as she is normally shy but one day got very angry at him for coming home late from work.
 * Prince Haru from Super Mario Bros.: Peach-hime Kyushutsu Dai Sakusen! is the only character in the Mario series other than Mario with whom Princess Peach has a romantic relationship.
 * According to the Super Mario World manual, the Sunken Ghost Ship was once one of the Airships utilized by the Koopalings in Super Mario Bros. 3.
 * Luigi is the only character to appear in every episode of the DiC Mario cartoons.