Sushi

Sushis are a shark-like enemy found in several Mario games. They have navy-blue colored scales, and a long pointed nose.

Super Mario 64
Sushis first appeared in Super Mario 64, where they could be found in 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. They also reappear in the DS remake, Super Mario 64 DS, acting the same way as they did in the original.

New Super Mario Bros.
Sushis make a minor appearance in this game, as Multiple Sushis only appear in World 1-A. In this level, they travel two at a time, at different positions on the screen. They can be defeated with fireballs or a Starman.

Mario Party
In the Mario Party mini-game Treasure Divers, a Sushi appears swimming around alongside two Bloopers.

Mario Party 2
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.

Mario Party 3
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. It also present in the minigame, Dizzy Dinghies.

Mario Party Advance
In Mario Party Advance, a Sushi lives at Sushi Cliff. When the player arrives, Sushi appears and asks the player for help after Shroomlock was pulled into the sea. However, when Shroomlock emerged, he states that somebody intentionally pulled him into the sea, and Sushi says that he interrogated the three that were around at the time of the crime: Blooper, Cheep Cheep, and Dolphin. After listening to the alibis, the crime is solved: Blooper pulled him in, as he is the only one with arms. Sushi then gives the player the Gaddget Digitizer. The ending of the game states that Sushi opened a bed and breakfast on the cliff side.

Mario Party 7
In Mario Party 7, the 1-vs-3 mini-game Be My Chum! involved the lone player calling out names of various enemies (including Sushi) on the Nintendo GameCube Microphone to attack the other players. They simply swam straight forward in a speedy manner.

Mario Hoops 3-on-3
In Mario Hoops 3-on-3 the course Bloocheep Sea has Sushi swimming in the background.