I know, the title of this article is slightly confusing, but it's not a metal skin for the spin-off character "Baby Mario". Actually, the article is about a Japanese Rock group called "Baby Metal" Which is getting it's very own Super Mario Maker costume. I know, it's sort of ridiculous how properties that seemingly have nothing to do with videogames at all are getting Super Mario Maker Costumes, but I suppose we'll just have to endure this strange addition to the game. This video is a Japanese announcement so I cannot yet confirm it for North America but it'll be pretty obvious when it's out in North America so I won't be updating the post when it is out.
Remember, Mario-Time-all-the-time