Mary O.

Mary O, known as Mashiko (ましこ Mashiko) outside North America, 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 can also be accessed online on the official website. 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.

Trivia

 * If the player taps Mary O's face on the Wii U GamePad in the User Info page, she will appear shocked.
 * Analyzing the game's data shows that Mary O was originally planned to be a Costume Mario.