Delfino Plaza is one of the main areas in Super Mario Sunshine and a stage in Super Smash Bros for Wii U (and Brawl). In Super Mario Sunshine, Mario came here to go on vacation, but was arrested because BOWSER....Junior! had been painting the place with graffiti. And then Bowser kidnapped Peach. As usual. And then the Super Smash Bros characters came here to beat the shit out of each other. And it was also a track in Mario Kart DS. And Mario Kart Wii.
...anyway, though, before the Smash Bros came, Everyone on Delfino Plaza was brutally killed from an unknown cause. Maybe it was that creepy-ass manta ray. Maybe it was Hcaep Ssecnirp. Or maybe I'm just making shit up. But still, where the hell are all the Piantas? The place is dead. It's deadfino plaza. But on to the stage. Delfino Plaza is your average tour-type stage, succeeded by Skyloft and Wuhu Island. It stops at many locales, such as the islands, rooftops, the giant Shine Sprite in the middle, and many more. It's a pretty fun stage, and it's even been debated as a competitive stage. Just because it's that fun. But still, why is everyone gone?