Gloop

Gloop the Fish first appeared in Banjo-Kazooie in the Clanker's Cavern level. He supplied Banjo with air in the form of bubbles while Banjo tried to raise Clanker by swimming through a key deep under water. His second appearance was in Banjo-Tooie in the Hailfire Peaks level. Banjo used the Shack Pack ability to venture into a pool of boiling water to get a fish for Boggy. Boggy called the fish "Din-Din" and the fish didn't talk so many players assume that the fish was Gloop, or that it was created from Gloop's design.