Glimmer

Glimmer the Angler Fish is an Animal Friend in the Donkey Kong franchise, who only appears in Donkey Kong Country 2: Diddy's Kong Quest. Glimmer lives in the sunken ships of Krem Quay, and has a lantern on his forehead for navigating the dark areas.

Donkey Kong Country 2: Diddy's Kong Quest
In Donkey Kong Country 2: Diddy's Kong Quest, where he only appears in his titular level, Glimmer's Galleon. Glimmer steadily follows behind Diddy and Dixie Kong, flashing his lantern for them to see the path ahead. He cannot be harmed by enemies.

In the Game Boy Advance remake, Glimmer's role became redundant due to the game's brighter visuals, enough for the player to see the Kongs' surroundings without his assistance.

Donkey Kong Land 2
Glimmer is absent from the Glimmer's Galleon stage in Donkey Kong Land 2, despite having his name in it. Instead, Glimmer's role was fulfilled by light-casting barrels.

Although he does not appear in-game, Glimmer still appears on the game's box art, which is based on Donkey Kong Country 2 promotional artwork of him guiding the Kongs underwater while a Lockjaw lurks behind them.

Donkey Kong Country
In the Club Nintendo comic adaptation of Donkey Kong Country 2, Glimmer makes a small cameo appearance in one panel to help Diddy Kong and Dixie Kong through the water of Krem Quay after the two fall into it while fleeing from a Kloak; it is not shown how the Kongs met Glimmer, nor is it shown when he departs from their company.

Trivia

 * Glimmer may have appeared in the now-canceled Nintendo GameCube game Donkey Kong Racing, as he briefly appears in the trailer, during the scene where Diddy Kong and Tiny Kong race on Enguardes underwater.
 * A similar Animal Friend known as the Lightfish appears in Gloomy Galleon in Donkey Kong 64, fulfilling the same role. In fact, it uses the name "Glimmer" in Japanese, Portuguese, and German, suggesting that it may just be a slightly-redesigned Glimmer.
 * Glimmer does not have teeth, which is rare for a real-world anglerfish.
 * Glimmer is not in the list of Animal Friends in the New Nintendo 3DS Virtual Console version's e-manual.