This is like the fake food you see in front of Japanese restaurants, but with Nintendo characters.
YouTuber Nendo Zaiker-Snail created this Mario sushi from polymer clay. You can see the process in the 12-minute Japanese language clip below.
What really sticks out is how this seems somewhat possible with real sushi. Make the Mario logo with tuna, for example, tamago for a Question Block, and uni for a Goomba. Of course, serve with pickled ginger in the shape of a star!
Nendo Zaiker-Snail has other Nintendo-themed polymer clay creations, like this Kirby breakfast sculpture.
Which looks delicious.