Several unused costumes are referenced in the game's CharaMarioTable.byaml file. None of them have graphics associated with them, however. Note that these names would not have been displayed in-game, as the in-game names are stored in a different file. These text strings are not present in the updated archives in updates 1.01 and above.[1]
There are several unused sprites found in the game files. Some sprites of Mario in Super Mario Bros. 3 suggest that ground-pounding and wall-jumping were originally going to be used in the other styles, outside of the New Super Mario Bros. U style.
An unused graphic of Mario with the modern colours.
An unused graphic of Fire Mario, internally referred to as "hipat.0".[2]
An unused graphic of Weird Mario with an extra button. It is named "appeal," suggesting that Weird Mario was initially supposed to have a pose for when down was pushed, similar to Costume Mario.[2]
An unused sliding graphic of Mario named "hipdrop."[4].
An unused graphic of Mario named "wall_kick." It is similar to Super Mario's jumping Sprite; however, the name suggests that it was originally intended be used for a wall jump, [4]