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Arthur T Knackerbracket has found the following story:

Nintendo only lets users choose from a limited number of preset profile pictures (or custom-made Miis) for their online avatar on the Switch network. So at least one Reddit user was quite surprised to see pornographic profile pictures showing up on the user-placed balloons in Super Mario Odyssey's online "Balloon World" mode.

"The picture was changed several times over the course of my time patrolling, each picture being pornographic content," Redditor ewaison writes, including links to (censored) screenshots of the offending profile pictures in their post. "There are multiple [sic] of these balloons all being made by the same user. This is obviously intentional, and made to upset children."

With the menu installed, users can load an arbitrary 256 x 256 resolution JPG onto their SD card and use a "Change Avatar" menu option to upload that file as their profile picture. Nintendo apparently stores (and then distributes) whatever gets uploaded directly on its servers rather than using some sort of internal ID tag to denote which preset profile picture should be used.

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