Super Mario has been around since the 80’s and has enduring popularity among gamers young and old. That combined with its cartoon basis, makes it an excellent subject for sand sculptures.
I made Super Mario once but oddly didn’t get a photo of it, so I’ll have to make him again someday!
Luigi, below, with seaweed for contrast and hair.
King Boo, yes, that’s a real character. And really easy and stable.
The seaweed helped provide contrast.