Dorrie

Dorrie is an ally to Mario, Luigi, and the inhabitants of the Mushroom Kingdom. Dorrie appears to resemble a blue plesiosaur. Dorrie mainly helps Mario and friends to cross certain water.

Super Mario 64/DS
Dorrie first appears in Super Mario 64 where he can be found inside of an underground cave in Hazy Maze Cave. Dorrie happily gives Mario a ride when he needs to. Dorrie swims around in circles continuously. He can also be controlled depending on which way Mario faces on which Dorrie copies. When Mario Ground Pounds Dorrie's head, it lowers.

Dorrie reappears in the remake, Super Mario 64 DS where his abilities return, but wears goggles this game. If Wario isn't being played, Dorrie can be seen with Wario's Cap on.

New Super Mario Bros.
Dorrie reappears in New Super Mario Bros. as an ally to Mario and Luigi by crossing toxic waters in World 4. Like Super Mario 64 DS, they possess goggles. If Mario or Luigi Ground Pounds on Dorrie, Dorrie swims faster.

Mario Party 5
Dorrie appears in Mario Party 5 in the minigame of Tug-o-Dorrie where the Dorries are plastic in the colors of red, blue, green, and yellow. In this game, players must pull off their opponents off their platforms with ropes. The last one-three standing win.

Mario Party Advance
Dorrie appears in Mario Party Advance where he is lonely as he says that he scared away Mr. E and wants a new dinosaur friend. Yoshi must come along and befriend Dorrie so he can get the Soil Sonar from Dorrie. The show Dorrie saying that Yoshi ought to visit him soon as he has not seen him in a while.

Trivia

 * Despite a warning sign saying to beware for Dorrie as he can eat some people if they come too close, Dorrie appears to be harmless.