Mary O.

Mary O., known as Mashiko (ましこ Mashiko) in Japanese and British English texts, is the manual's guide in Super Mario Maker. She is available to be spoken to at any time from the game's menu, by tapping the green manual icon. The game's manual was also accesible online on the official website before the Super Mario Maker website was replaced by the one of its sequel. Her role is to assist the player, and share information about the game's content. Her appearance is that of a young female with blue eyes and dark hair, and a headset on. Mary O.'s name is deliberately a pun on a common mispronunciation of Mario's name. Her Japanese name, Mashiko, is a play on "Mario".

A March 2016 update allows players to play as Mary O. in a construction outfit, through the Costume Mario power-up. To unlock the costume, players have to clear the special Event Course created after her, titled "Mary O.'s Lunch Break". There are also special Event Courses created by her ranging back to October 2015, though those do not involve her costume.

A series of online comics starring her and Yamamura, titled Super Mario Maker: Crash Course, have been released on the official Super Mario Maker website.

While Mary O. does not return in Super Mario Maker 2, her role is fulfilled by another apprentice of Yamamura's named Nina.

Super Mario Maker for Nintendo 3DS

 * Digital manual description: "Fondly referred to by her peers as "everyone's older sister," Mary has a lot to teach you about Super Mario Maker for Nintendo 3DS. She knows just about everything there is to know about the game, but when it comes to actually making courses... Well, she hasn't had a lot of hands-on experience!"

Trivia

 * If the player taps Mary O.'s face on the Wii U GamePad in the User Info page, she will appear shocked.
 * Nintendo Japan has stated voice clips for Mary O.'s Costume Mario is provided by Yu Ayasaki from Daigasso! Band Bros. P around the time of her Event Course and costume's release.