Nina (Super Mario Maker 2)
From the Super Mario Wiki
Nina is a non-playable human character who appears in Super Mario Maker 2 as Yamamura's assistant during Yamamura's Dojo, where she and Yamamura give the player tips on creating courses. Before Super Mario Maker 2's release, Nina was first seen on the Japanese website for the game. She seems to be the replacement for Mary O. from the first game, as Mary O. is not seen nor mentioned at all in Super Mario Maker 2.
Nina also appears alongside Yamamura when selecting the "View Controls" option for game-style exclusive power-ups, as well as in the Maker Basics option, where she and Yamamura guide the player on the basics of using the Course Maker.
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