Sushi

Sushis are a shark enemy found in several Mario games.

Sushis appear in one level of Super Mario 64, Dire, Dire Docks. These sharks swim around, minding their own business. There is no way to attack them, and they usually won't bother Mario, unless he accidentally swims into them.

Multiple Sushis also appear in World 1-A in New Super Mario Bros. and some made appearances in the Mario Party series.

In Mario Party 2, one appears in Pirate Land, and will ferry anyone who lands next to the dock of one island to the dock on the opposing island, charging five coins per trip.

In Mario Party 3, a Sushi appears in Deep Bloober Sea, and is in charge of the torpedo controls. This Sushi will ask everyone who passes to push one of four buttons upon reaching a fork; one of which serves as the detonator, which will fire a torpedo when pushed, forcing the player to take the path they didn't select.

In Mario Party 7, a 3v1 minigame involved the lone player calling out names of various enemies, (including Sushi) on the gamecube microphone, to attack the other players. They simply swam straight forward in a speedy manner.

Trivia

 * As a Real World term, sushi is applied to a type of Japanese food that can include fish.