It’s entirely possible—likely, even—that you’ve never heard of Starfy. The Legendary Starfy was a platforming series only released in Japan (save the one aforementioned title), featuring an aquatic starfish character who quickly became a beloved entry in Nintendo’s character roster.
The Starfy games contained not only platforming gameplay, but also some puzzles, which gave them a diverse appeal that echoed the Kirby series in many ways.
It was only the very last game, The Legendary Starfy, that arrived here in the west, but there’s been no sign of Starfy since 2009. Naturally, there are still many fans of the character both in Japan and here, so he will be coming to Super Mario Maker as the newest costume for the game.
The event course & character will be live on April 1st in Japan, so we imagine it’ll arrive here sometime soon too.