"In Conker's Pocket Tales Conker the Squirrel has to rescue his girlfriend, Berri, from the Evil Acorn; the same version of Conker appears in Diddy Kong Racing, where he is a playable character.
In the newer games, the protagonist Conker is a greedy, heavy drinking, red squirrel. Conker, though highly materialistic and never afraid to insult, always approaches new characters with a positive outlook. Conker's adventures occur because he gets drunk and wanders in the opposite direction to his home. In the XBLA version of Banjo Kazooie, his picture is seen in the Rusty Bucket Bay level where Berri's originally was.
Source: Wikipedia, "Conker_the_Squirrel", available under the CC-BY-SA License.