Enguarde the Swordfish
From the Super Mario Wiki
“For aquatic adventuring, Enguarde is essential. While riding him, you do not need to press the B Button to swim; the Control Pad directional arrows are enough. By pressing the Y or B Button, you can get a burst of speed during which Enguarde's sword nose becomes a deadly weapon. Needless to say, you won't find Enguarde anywhere but underwater.”
Enguarde the Swordfish is an Animal Buddy in the Donkey Kong series who first appears in Donkey Kong Country; he shares the most number of appearances in the series with Squawks the Parrot (though Squawks only carries a flashlight and is not playable in the original Donkey Kong Country).
 Donkey Kong series
 Donkey Kong Country
In Donkey Kong Country, Enguarde is the greatest swimmer of all the Kongs and Animal Buddies and is invaluable since they are generally helpless underwater and his pointed bill can be used to attack enemies there; however, he is useless on land and cannot jump out of the water.
 Donkey Kong Country 2: Diddy's Kong Quest/Donkey Kong Land 2
Levels: Enguarde appears in both versions unless otherwise stated.
 Donkey Kong Country 3: Dixie Kong's Double Trouble!
Enguarde is one of only three Animal Buddies who get to fight a boss character. Enguarde fights Barbos the sea urchin during the events of Donkey Kong Country 3: Dixie Kong's Double Trouble! and Donkey Kong Land III. Unfortunately, he is incapable of using his Supercharge attack in Donkey Kong Land III.
 Donkey Kong Land III
 Donkey Kong 64
 Donkey Kong Barrel Blast
Enguarde appears in Donkey Kong Barrel Blast as a rideable Animal Buddy in underwater levels once he is released from his crate.
 Club Nintendo
 Donkey Kong Country
Enguarde appeared as Donkey and Diddy's Animal Buddy in the third part of Club Nintendo's comic "Donkey Kong Country". Donkey Kong and Diddy Kong ride him through a body of water, while being attacked by several underwater enemies. An exploding TNT Barrel pushes them out of the water and onto King K. Rool's ship Gangplank Galleon, after which Enguarde does not appear again.
Enguarde appears in issue 14 of Super Mario-Kun. After Donkey Kong and Diddy Kong ride on a fake Enguarde, Mario and Yoshi find a box that contains Enguarde. They meet Donkey Kong and Diddy Kong in ropes. Before Mario can do anything, he gets attacked by a Croctopus. Enguarde saves him, but a Clambo breaks his nose. Mario responds by attaching a drill to his nose. Enguarde then plows through the Croctopus, breaking its arms.
 Trophy Information from Super Smash Bros. Brawl
 Names in Other Languages